diff --git a/lib/spoolmount.scad b/lib/spoolmount.scad
new file mode 100644
index 0000000..2fb33b5
--- /dev/null
+++ b/lib/spoolmount.scad
@@ -0,0 +1,19 @@
+use <torus.scad>
+
+module spoolmount() {
+    // Ring
+    difference() {
+        cylinder(h=5, r=42, $fn=200);
+
+        translate([0, 0, -1])
+        cylinder(h=7, r=25, $fn=200);
+    }
+
+    // Rounded edges
+    translate([0, 0, 2.5]) {
+        torus(r_major=25, r_minor=2.5, xs=0.7, $fn=200);
+        torus(r_major=42, r_minor=2.5, xs=0.7, $fn=200);
+    }
+}
+
+spoolmount();
\ No newline at end of file
diff --git a/lib/spoolmount_a.scad b/lib/spoolmount_a.scad
index e9719fa..feea8e1 100644
--- a/lib/spoolmount_a.scad
+++ b/lib/spoolmount_a.scad
@@ -1,14 +1,8 @@
-use <torus.scad>
+use <spoolmount.scad>
 
 // SpoolMount fixed side (i.e. attached to printer or enclosure)
 module spoolmount_a() {
-    // Ring
-    difference() {
-        cylinder(h=5, r=42, $fn=200);
-
-        translate([0, 0, -1])
-        cylinder(h=7, r=25, $fn=200);
-    }
+    spoolmount();
 
     // Hooks
     for (x = [-33, 33]) {
@@ -43,15 +37,6 @@ module spoolmount_a() {
             [0, 0],
         ]);
     }
-
-    // Rounded edges
-    translate([0, 0, 2.5]) {
-        // Inside
-        torus(r_major=25, r_minor=2.5, xs=0.7, $fn=200);
-    
-        // Outside
-        torus(r_major=42, r_minor=2.5, xs=0.7, $fn=200); // 43.75
-    }
 }
 
 spoolmount_a();
\ No newline at end of file
diff --git a/lib/spoolmount_b.scad b/lib/spoolmount_b.scad
index a05ada4..9f50d1a 100644
--- a/lib/spoolmount_b.scad
+++ b/lib/spoolmount_b.scad
@@ -1,14 +1,10 @@
-use <torus.scad>
+use <spoolmount.scad>
 
 // SpoolMount removable side (i.e. attached to spool holder or cage)
 module spoolmount_b() {
     difference() {
-        // Ring
-        cylinder(h=5, r=42, $fn=200);
+        spoolmount();
 
-        translate([0, 0, -1])
-        cylinder(h=7, r=25, $fn=200);
-    
         // Holes
         for (a = [0 : 30 : 330]) {
             rotate([0, 0, a])
@@ -21,19 +17,13 @@ module spoolmount_b() {
                 translate([3.25, 0, 4])
                 rotate([45, 0, 0])
                 cube([6.5, sqrt(72), sqrt(72)], center=true);
-            
+
                 // Flat top cutout
                 translate([3.25, 0, 5])
                 cube([6.5, 12, 2], center=true);
             }
         }
     }
-            
-    // Rounded edges
-    translate([0, 0, 2.5]) {
-        torus(r_major=25, r_minor=2.5, xs=0.7, $fn=200);
-        torus(r_major=42, r_minor=2.5, xs=0.7, $fn=200);
-    }
 }
 
 spoolmount_b();
\ No newline at end of file