diff --git a/bottom.scad b/bottom.scad
index f475fca..89cec3f 100644
--- a/bottom.scad
+++ b/bottom.scad
@@ -1,42 +1,28 @@
 include <constants.scad>;
+use<utils.scad>
 $fn = 90;
 
 
-module arms(angles, height, dia) {
-    for(angle = angles) {
-    rotate([0, 0, angle])
-            translate([arm_radius / 2, 
-                        0,
-                        height])
-                rotate([0, 90, 0])
-                    cylinder(r = dia / 2, 
-                        h = arm_radius,
-                        center = true); 
-    }
-}
-
-
-
 difference() {
     union() {
         cylinder(r = bottom_outer_diameter / 2, h = bottom_height);
-        
+
         translate([0, 0, bottom_height])
-                cylinder(r = insert_diameter/2, 
+                cylinder(r = insert_diameter/2,
                         h = insert_length);
-        
-        arms([0, 180], arm_dia/2, arm_dia);
-        arms([90,270], bottom_short_loop_arms_height, arm_dia);
+
+        arms([0, 180], arm_radius, arm_dia/2, arm_dia);
+        arms([90,270], arm_radius, bottom_short_loop_arms_height, arm_dia);
     }
 
     union() {
         cylinder(r = bottom_inner_diameter / 2, h = bottom_inner_depth);
 
-        cylinder(r = insert_hole_dia / 2, 
+        cylinder(r = insert_hole_dia / 2,
                 h = insert_length + bottom_height);
-        
-        arms([0, 180], arm_dia/2, arm_hole_dia);
-        arms([90,270], bottom_short_loop_arms_height, arm_hole_dia);
-        arms([0,180], bottom_short_loop_arms_height, bottom_work_hole_dia);
+
+        arms([0, 180], arm_radius, arm_dia / 2, arm_hole_dia);
+        arms([90,270], arm_radius, bottom_short_loop_arms_height, arm_hole_dia);
+        arms([0,180], bottom_outer_diameter / 2, bottom_short_loop_arms_height, bottom_work_hole_dia);
     }
-}
\ No newline at end of file
+}
diff --git a/lengths.dxf b/lengths.dxf
index 8ab208b..86441ee 100644
--- a/lengths.dxf
+++ b/lengths.dxf
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 AcDbEntity
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@@ -4987,7 +6523,7 @@ ENTITIES
   0
 LINE
   5
-A1
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 100
 AcDbEntity
   8
@@ -5011,7 +6547,7 @@ AcDbLine
   0
 LINE
   5
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 AcDbEntity
   8
@@ -5035,7 +6571,7 @@ AcDbLine
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 AcDbEntity
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@@ -5059,7 +6595,7 @@ AcDbLine
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 AcDbEntity
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@@ -5083,7 +6619,7 @@ AcDbLine
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 LINE
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@@ -5107,7 +6643,7 @@ AcDbLine
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@@ -5131,7 +6667,7 @@ AcDbLine
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 AcDbEntity
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@@ -5155,7 +6691,7 @@ AcDbLine
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@@ -5179,7 +6715,7 @@ AcDbLine
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@@ -5203,7 +6739,7 @@ AcDbLine
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 100
 AcDbEntity
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@@ -5225,7 +6761,7 @@ AcDbCircle
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@@ -5249,7 +6785,7 @@ AcDbLine
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 LINE
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 AcDbEntity
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@@ -5273,7 +6809,7 @@ AcDbLine
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 AcDbEntity
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@@ -5297,7 +6833,7 @@ AcDbLine
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-AE
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 AcDbEntity
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@@ -5321,7 +6857,7 @@ AcDbLine
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   5
-AF
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 AcDbEntity
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@@ -5345,7 +6881,7 @@ AcDbLine
   0
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   5
-B0
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@@ -5369,7 +6905,7 @@ AcDbLine
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   5
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 AcDbEntity
   8
@@ -5393,7 +6929,7 @@ AcDbLine
   0
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 AcDbEntity
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@@ -5417,7 +6953,7 @@ AcDbLine
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 AcDbEntity
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@@ -5441,7 +6977,7 @@ AcDbLine
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@@ -5465,7 +7001,7 @@ AcDbLine
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@@ -5489,7 +7025,7 @@ AcDbLine
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@@ -5513,7 +7049,7 @@ AcDbLine
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 AcDbEntity
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@@ -5535,7 +7071,7 @@ AcDbCircle
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   5
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 AcDbEntity
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@@ -5559,7 +7095,7 @@ AcDbLine
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@@ -5583,7 +7119,7 @@ AcDbLine
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@@ -5607,7 +7143,7 @@ AcDbLine
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@@ -5631,7 +7167,7 @@ AcDbLine
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@@ -5655,7 +7191,7 @@ AcDbLine
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@@ -5679,7 +7215,7 @@ AcDbLine
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@@ -5703,7 +7239,7 @@ AcDbLine
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@@ -5727,7 +7263,7 @@ AcDbLine
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@@ -5751,7 +7287,7 @@ AcDbLine
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@@ -5775,7 +7311,7 @@ AcDbLine
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@@ -5799,7 +7335,7 @@ AcDbLine
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@@ -5823,7 +7359,7 @@ AcDbLine
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@@ -5847,7 +7383,7 @@ AcDbLine
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@@ -5871,7 +7407,7 @@ AcDbLine
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@@ -5895,7 +7431,7 @@ AcDbLine
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-C7
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@@ -5919,7 +7455,7 @@ AcDbLine
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-C8
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@@ -5943,7 +7479,7 @@ AcDbLine
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@@ -5967,7 +7503,7 @@ AcDbLine
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@@ -5991,7 +7527,7 @@ AcDbLine
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@@ -6015,7 +7551,7 @@ AcDbLine
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@@ -6039,7 +7575,7 @@ AcDbLine
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   8
@@ -6063,7 +7599,7 @@ AcDbLine
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-CE
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@@ -6087,7 +7623,7 @@ AcDbLine
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-CF
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@@ -6111,7 +7647,7 @@ AcDbLine
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@@ -6135,7 +7671,7 @@ AcDbLine
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 100
 AcDbEntity
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@@ -6159,7 +7695,7 @@ AcDbLine
   0
 DIMENSION
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 100
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   8
@@ -6223,7 +7759,7 @@ AcDbRotatedDimension
   0
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   5
-D3
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 AcDbEntity
   8
@@ -6247,7 +7783,7 @@ AcDbLine
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-D4
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 AcDbEntity
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@@ -6269,7 +7805,7 @@ AcDbCircle
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-D5
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 AcDbEntity
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@@ -6293,7 +7829,7 @@ AcDbLine
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-D6
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 AcDbEntity
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@@ -6317,7 +7853,7 @@ AcDbLine
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 AcDbEntity
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@@ -6341,7 +7877,7 @@ AcDbLine
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 AcDbEntity
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@@ -6365,7 +7901,7 @@ AcDbLine
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@@ -6413,7 +7949,7 @@ AcDbLine
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@@ -6437,7 +7973,7 @@ AcDbLine
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@@ -6461,7 +7997,7 @@ AcDbLine
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   8
@@ -6525,7 +8061,7 @@ AcDbRotatedDimension
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 DIMENSION
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 100
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@@ -6589,7 +8125,7 @@ AcDbRotatedDimension
   0
 DIMENSION
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 100
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@@ -6653,7 +8189,7 @@ AcDbRotatedDimension
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   5
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@@ -6717,7 +8253,7 @@ AcDbRotatedDimension
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 DIMENSION
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@@ -6781,7 +8317,7 @@ AcDbRotatedDimension
   0
 DIMENSION
   5
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@@ -6845,7 +8381,7 @@ AcDbRotatedDimension
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@@ -6957,7 +8493,7 @@ AcDbLine
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 DIMENSION
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 100
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   8
@@ -7015,6 +8551,378 @@ AcDbAlignedDimension
  50
 90
 100
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+  0
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+  5
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+ 14
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+0
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   0
 ENDSEC
diff --git a/top.scad b/top.scad
index 897f8fe..2d981b5 100644
--- a/top.scad
+++ b/top.scad
@@ -1,56 +1,36 @@
 include <constants.scad>;
-
+use<utils.scad>;
 $fn = 90;
 
-module top() {    
+module top() {
     difference() {
-        
+
         union() {
-            cylinder(r = top_outer_diameter/2,
+            cylinder(r = top_outer_diameter / 2,
                 h = top_height);
-            
-            for(angle = [0, 90, 180, 270]) {
-                rotate([0, 0, angle])
-                    translate([arm_radius / 2, 
-                                0,
-                                top_height - arm_dia / 2])
-                
-                        rotate([0, 90, 0])
-                            cylinder(r = arm_dia / 2, 
-                                h = arm_radius,
-                                center = true); 
-            }
-            
+
+            arms([0, 90, 180, 270], arm_radius, top_height - arm_dia / 2, arm_dia);
+
             translate([0, 0, -insert_length])
-                cylinder(r = insert_diameter/2, 
+                cylinder(r = insert_diameter / 2,
                         h = insert_length);
         }
-        
+
         union()  {
             translate([0, 0, top_height - top_inner_depth])
-                cylinder(r = top_inner_diameter/2,
+                cylinder(r = top_inner_diameter / 2,
                         h = top_inner_depth);
-            
-            for(angle = [0, 90, 180, 270]) {
-                rotate([0, 0, angle])
-                    translate([arm_radius / 2, 
-                                0,
-                                top_height - arm_dia / 2])
-                
-                        rotate([0, 90, 0])
-                            cylinder(r = arm_hole_dia / 2, 
-                                h = arm_radius,
-                                center = true); 
-            }
-            
+
+            arms([0, 90, 180, 270], arm_radius, top_height - arm_dia / 2, arm_hole_dia);
+
             translate([0, 0, -insert_length])
-                cylinder(r = insert_hole_dia / 2, 
+                cylinder(r = insert_hole_dia / 2,
                         h = insert_length + top_height);
         }
     }
-    
-    
+
+
 };
 
 
-top();
\ No newline at end of file
+top();
diff --git a/utils.scad b/utils.scad
new file mode 100644
index 0000000..ae8ef7b
--- /dev/null
+++ b/utils.scad
@@ -0,0 +1,14 @@
+include <constants.scad>;
+
+module arms(angles, radius, height, dia) {
+    for(angle = angles) {
+    rotate([0, 0, angle])
+            translate([radius / 2,
+                        0,
+                        height])
+                rotate([0, 90, 0])
+                    cylinder(r = dia / 2,
+                        h = radius,
+                        center = true);
+    }
+}