diff --git a/constants.scad b/constants.scad
index 45ee499..7b61324 100644
--- a/constants.scad
+++ b/constants.scad
@@ -1,15 +1,25 @@
 insert_diameter = 13.5;
 insert_length = 20;
 insert_hole_dia = 10;
+insert_arm_radius = 30;
+
+arm_dia = 10;
+arm_hole_dia = 3;
+arm_radius = 25;
+
 
 top_inner_diameter = 20;
 top_outer_diameter = 30;
 top_height = 15;
 top_inner_depth = 10;
 
-arm_dia = 10;
-arm_hole_dia = 3;
-arm_radius = 25;
+
+middle_outer_diameter = 20;
+middle_inner_diameter = 10;
+middle_height = 50;
+middle_short_loop_arms_height = 36.95;
+middle_long_loop_arms_height = 19.05;
+
 
 bottom_outer_diameter = 30;
 bottom_inner_diameter = 20;
diff --git a/lengths.dxf b/lengths.dxf
index 86441ee..b863314 100644
--- a/lengths.dxf
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-100
-AcDbEntity
-  8
-middle
-  6
-ByLayer
- 62
-  256
-370
-   -1
-100
-AcDbDimension
-  2
-*D13
- 10
--40
- 20
-495
- 30
-0
- 11
--41.875
- 21
-514.525
- 31
-0
- 70
-   32
- 71
-    5
-  3
-Standard
- 53
-0
-210
-0
-220
-0
-230
-1
-100
-AcDbAlignedDimension
- 13
--30.00000000000002
- 23
-534.05
- 33
-0
- 14
--7.000000000000001
- 24
-495
- 34
-0
- 50
-90
-100
-AcDbRotatedDimension
-  0
-DIMENSION
-  5
-122
-100
-AcDbEntity
-  8
-middle
-  6
-ByLayer
- 62
-  256
-370
-   -1
-100
-AcDbDimension
-  2
-*D14
- 10
 40
  20
 527.05
@@ -8865,7 +8741,7 @@ AcDbRotatedDimension
   0
 DIMENSION
   5
-123
+121
 100
 AcDbEntity
   8
@@ -8879,7 +8755,7 @@ ByLayer
 100
 AcDbDimension
   2
-*D15
+*D13
  10
 49.99999999999999
  20
@@ -8923,6 +8799,130 @@ AcDbAlignedDimension
  50
 90
 100
+AcDbRotatedDimension
+  0
+DIMENSION
+  5
+122
+100
+AcDbEntity
+  8
+middle
+  6
+ByLayer
+ 62
+  256
+370
+   -1
+100
+AcDbDimension
+  2
+*D14
+ 10
+-40
+ 20
+515
+ 30
+0
+ 11
+-41.875
+ 21
+524.525
+ 31
+0
+ 70
+   32
+ 71
+    5
+  3
+Standard
+ 53
+0
+210
+0
+220
+0
+230
+1
+100
+AcDbAlignedDimension
+ 13
+-30.00000000000002
+ 23
+534.05
+ 33
+0
+ 14
+-10
+ 24
+515
+ 34
+0
+ 50
+90
+100
+AcDbRotatedDimension
+  0
+DIMENSION
+  5
+123
+100
+AcDbEntity
+  8
+middle
+  6
+ByLayer
+ 62
+  256
+370
+   -1
+100
+AcDbDimension
+  2
+*D15
+ 10
+-50.00000000000001
+ 20
+551.95
+ 30
+0
+ 11
+-51.87500000000001
+ 21
+533.475
+ 31
+0
+ 70
+   32
+ 71
+    5
+  3
+Standard
+ 53
+0
+210
+0
+220
+0
+230
+1
+100
+AcDbAlignedDimension
+ 13
+-10
+ 23
+515
+ 33
+0
+ 14
+-2.100575422237498e-14
+ 24
+551.95
+ 34
+0
+ 50
+90
+100
 AcDbRotatedDimension
   0
 ENDSEC
diff --git a/middle.scad b/middle.scad
new file mode 100644
index 0000000..800a459
--- /dev/null
+++ b/middle.scad
@@ -0,0 +1,38 @@
+include <constants.scad>;
+use<utils.scad>;
+$fn = 90;
+
+difference() {
+	union() {
+		cylinder(r = middle_outer_diameter / 2,
+			h = middle_height);
+
+        translate([0, 0, -insert_length])
+            cylinder(r = insert_diameter / 2,
+                    h = insert_length);
+
+		translate([0, 0, middle_height])
+            cylinder(r = insert_diameter / 2,
+                    h = insert_length);
+
+		arms([0, 180], insert_arm_radius, middle_long_loop_arms_height, insert_diameter);
+        arms([90, 270], insert_arm_radius, middle_short_loop_arms_height, insert_diameter);
+	}
+
+
+	union() {
+		cylinder(r = middle_inner_diameter / 2,
+			h = middle_height);
+
+		translate([0, 0, -insert_length])
+			cylinder(r = insert_hole_dia / 2,
+				h = insert_length);
+
+		translate([0, 0, middle_height])
+				cylinder(r = insert_hole_dia / 2,
+				h = insert_length);
+        
+        arms([0, 180], insert_arm_radius, middle_long_loop_arms_height, insert_hole_dia);
+        arms([90, 270], insert_arm_radius, middle_short_loop_arms_height, insert_hole_dia);
+	}
+}
diff --git a/top.scad b/top.scad
index 2d981b5..25f0996 100644
--- a/top.scad
+++ b/top.scad
@@ -2,35 +2,29 @@ include <constants.scad>;
 use<utils.scad>;
 $fn = 90;
 
-module top() {
-    difference() {
 
-        union() {
-            cylinder(r = top_outer_diameter / 2,
-                h = top_height);
+difference() {
 
-            arms([0, 90, 180, 270], arm_radius, top_height - arm_dia / 2, arm_dia);
+    union() {
+        cylinder(r = top_outer_diameter / 2,
+            h = top_height);
 
-            translate([0, 0, -insert_length])
-                cylinder(r = insert_diameter / 2,
-                        h = insert_length);
-        }
+        arms([0, 90, 180, 270], arm_radius, top_height - arm_dia / 2, arm_dia);
 
-        union()  {
-            translate([0, 0, top_height - top_inner_depth])
-                cylinder(r = top_inner_diameter / 2,
-                        h = top_inner_depth);
-
-            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,
-                        h = insert_length + top_height);
-        }
+        translate([0, 0, -insert_length])
+            cylinder(r = insert_diameter / 2,
+                    h = insert_length);
     }
 
+    union()  {
+        translate([0, 0, top_height - top_inner_depth])
+            cylinder(r = top_inner_diameter / 2,
+                    h = top_inner_depth);
 
-};
+        arms([0, 90, 180, 270], arm_radius, top_height - arm_dia / 2, arm_hole_dia);
 
-
-top();
+        translate([0, 0, -insert_length])
+            cylinder(r = insert_hole_dia / 2,
+                    h = insert_length + top_height);
+    }
+}