Port spoolmount library refactor: add bump, consolidate extension_twist, drop clip variant

v1/scad/lib/generic/spoolmount.scad

@@ -42,7 +42,16 @@ module spoolmount(h=5) {
                     [-4, 2],
                     [-4, -1],
                 ]);
-
+                
+                rotate([90, 0, 90])
+                linear_extrude(4, center=true)
+                polygon(points=[
+                    [-6, -1],
+                    [-4, 1],
+                    [4, 1],
+                    [6, -1],
+                ]);
+                
                 // Access cutout
                 if (h > 5) {
                     difference() {
@@ -78,7 +87,7 @@ module spoolmount(h=5) {
     intersection() {
         cylinder(h=5, r=25.1, $fn=200);
 
-        for (a = [45 : 90 : 335]) {
+        for (a = [45 : 180 : 335]) {
             // Locking bumps
             rotate([0, 0, a - 10])
             rotate_extrude(angle=20, $fn=200)
@@ -93,7 +102,7 @@ module spoolmount(h=5) {
 
             // Rounded bump ends
             for (o = [-10, 10]) {
-                rotate([0, 0, a + o])
+                rotate([0, 0, a + 90 + o])
                 translate([0, 30.1, 0])
                 scale([0.2, 1.0, 1.0])
                 rotate_extrude($fn=200)