diff --git a/printed/psu_shroud.scad b/printed/psu_shroud.scad
index 54a0185..f93b531 100644
--- a/printed/psu_shroud.scad
+++ b/printed/psu_shroud.scad
@@ -33,10 +33,8 @@ wall = 1.8;
 top = 1.5;
 screw = M3_cap_screw;
 insert = screw_insert(screw);
-boss_r = wall + corrected_radius(insert_hole_radius(insert));
-boss_h = insert_hole_length(insert);
+boss_r = insert_boss_radius(insert, wall);
 counter_bore = 2;
-boss_h2 = boss_h + counter_bore;
 rad = 2;
 clearance = layer_height;
 overlap = 6;
@@ -137,49 +135,13 @@ module psu_shroud(type, cable_d, name, cables = 1) { //! Generate the STL file f
                         translate([0, height / 2])
                                 vertical_tearslot(h = 0, r = cable_d / 2, l = cable_d);
                 }
-
-    mirror([0, 1, 0]) {
-        // insert boss
-        translate_z(height - boss_h)
-            linear_extrude(height = boss_h)
-                psu_shroud_hole_positions(type)
-                    difference() {
-                        hull() {
-                            circle(boss_r);
-
-                            translate([0, $side * (boss_r - 1)])
-                                square([2 * boss_r, eps], center = true);
-                        }
-                        poly_circle(insert_hole_radius(insert));
-                    }
-
-        // insert boss counter_bore
-        translate_z(height - boss_h2)
-            linear_extrude(height = counter_bore + eps)
-                psu_shroud_hole_positions(type)
-                    difference() {
-                        hull() {
-                            circle(boss_r);
-
-                            translate([0, $side * (boss_r - 1)])
-                                square([2 * boss_r, eps], center = true);
-                        }
-                        poly_circle(insert_screw_diameter(insert) / 2 + 0.1);
-                    }
-        // support cones
-        translate_z(height - boss_h2)
-            psu_shroud_hole_positions(type)
-                hull() {
-                    cylinder(h = eps, r = boss_r - eps);
-
-                    translate([0, $side * (boss_r - 1)])
-                        cube([2 * boss_r, eps, eps], center = true);
-
-                    translate([0, $side * (boss_r - wall), - (2 * boss_r - wall)])
-                        cube(eps);
-                }
-    }
-}
+    // insert lugs
+    mirror([0, 1, 0])
+        psu_shroud_hole_positions(type)
+            translate_z(height)
+                rotate(90)
+                    insert_lug(insert, wall, $side, counter_bore);
+ }
 
 module psu_shroud_assembly(type, cable_d, name, cables = 1) //! The printed parts with inserts fitted
 assembly(str("psu_shroud_", name)) {
diff --git a/printed/ssr_shroud.scad b/printed/ssr_shroud.scad
index 860c2f2..8eab5a3 100644
--- a/printed/ssr_shroud.scad
+++ b/printed/ssr_shroud.scad
@@ -33,10 +33,8 @@ wall = 1.8;
 top = 1.5;
 screw = M3_cap_screw;
 insert = screw_insert(screw);
-boss_r = wall + corrected_radius(insert_hole_radius(insert));
-boss_h = insert_hole_length(insert);
+boss_r = insert_boss_radius(insert, wall);
 counter_bore = 2;
-boss_h2 = boss_h + counter_bore;
 rad = 3;
 clearance = layer_height;
 
@@ -61,7 +59,6 @@ module ssr_shroud_holes(type, cable_d) { //! Drill the screw and ziptie holes
         translate([ssr_shroud_cable_x(type, cable_d), side * (ssr_width(type) / 2 - 2 * boss_r)])
             rotate(-90)
                 cable_tie_holes(cable_d / 2, h = 0);
-
 }
 
 module ssr_shroud(type, cable_d, name) {    //! Generate the STL file for a specified ssr and cable
@@ -103,45 +100,11 @@ module ssr_shroud(type, cable_d, name) {    //! Generate the STL file for a spec
                             vertical_tearslot(h = 0, r = cable_d / 2, l = cable_d);
                     }
     // insert boss
-    translate_z(height - boss_h)
-        linear_extrude(height = boss_h)
-            ssr_shroud_hole_positions(type)
-                difference() {
-                    hull() {
-                        circle(boss_r);
-
-                        translate([0, -$side * (boss_r - 1)])
-                            square([2 * boss_r, eps], center = true);
-                    }
-                    poly_circle(insert_hole_radius(insert));
-                }
-
-    // insert boss counter_bore
-    translate_z(height - boss_h2)
-        linear_extrude(height = counter_bore + eps)
-            ssr_shroud_hole_positions(type)
-                difference() {
-                    hull() {
-                        circle(boss_r);
-
-                        translate([0, -$side * (boss_r - 1)])
-                            square([2 * boss_r, eps], center = true);
-                    }
-                    poly_circle(insert_screw_diameter(insert) / 2 + 0.1);
-                }
-    // support cones
     ssr_shroud_hole_positions(type)
-        hull() {
-            translate_z(-height + boss_h2) {
-                cylinder(h = eps, r = boss_r - eps);
-
-                translate([0, -$side * (boss_r - 1)])
-                    cube([2 * boss_r, eps, eps], center = true);
-            }
-            translate([0, -$side * (boss_r - wall), -height + boss_h2 + (2 * boss_r - wall)])
-                cube(eps);
-        }
-
+        vflip()
+            translate_z(height)
+                rotate(90)
+                    insert_lug(insert, wall, $side, counter_bore);
 }
 
 module ssr_shroud_assembly(type, cable_d, name) //! The printed parts with inserts fitted
@@ -153,7 +116,6 @@ assembly(str("ssr_shroud_", name)) {
 
     ssr_shroud_hole_positions(type)
         insert(insert);
-
 }
 
 module ssr_shroud_fastened_assembly(type, cable_d, thickness, name) //! Assembly with screws in place
@@ -177,6 +139,4 @@ module ssr_shroud_fastened_assembly(type, cable_d, thickness, name) //! Assembly
                     color(grey20)
                         cylinder(d = cable_d, h = 20, center = true);
         }
-
-
 }
diff --git a/readme.md b/readme.md
index f6d6966..d122006 100644
--- a/readme.md
+++ b/readme.md
@@ -900,6 +900,7 @@ Heatfit threaded inserts. Can be pushed into thermoplastics using a soldering ir
 | ```insert(type)``` | Draw specified insert |
 | ```insert_boss(type, z, wall = 2 * extrusion_width)``` | Make a boss to take an insert |
 | ```insert_hole(type, counterbore = 0, horizontal = false)``` | Make a hole to take an insert, ```counterbore``` is the extra length for the screw |
+| ```insert_lug(insert, wall, side, counter_bore = 0)``` | Make a flying insert lug, see [ssr_shroud](#Ssr_shroud) |
 
 ![inserts](tests/png/inserts.png)
 
diff --git a/vitamins/insert.scad b/vitamins/insert.scad
index 9a34b1f..5cdd014 100644
--- a/vitamins/insert.scad
+++ b/vitamins/insert.scad
@@ -107,3 +107,45 @@ module insert_boss(type, z, wall = 2 * extrusion_width) { //! Make a boss to tak
                 insert_hole(type, max(0, z - insert_hole_length(type) - 2 * layer_height));
         }
 }
+
+module insert_lug(insert, wall, side, counter_bore = 0) {
+    boss_r = insert_boss_radius(insert, wall);
+    boss_h = insert_hole_length(insert);
+    boss_h2 = boss_h + counter_bore;
+    translate_z(-boss_h)
+        linear_extrude(height = boss_h)
+             difference() {
+                hull() {
+                    circle(boss_r);
+
+                    translate([side * (boss_r - 1), 0])
+                        square([eps, 2 * boss_r], center = true);
+                }
+                poly_circle(insert_hole_radius(insert));
+            }
+
+    // insert boss counter_bore
+    translate_z(-boss_h2) {
+        linear_extrude(height = counter_bore + eps)
+             difference() {
+                hull() {
+                    circle(boss_r);
+
+                    translate([side * (boss_r - 1), 0])
+                        square([eps, 2 * boss_r], center = true);
+                }
+                poly_circle(insert_screw_diameter(insert) / 2 + 0.1);
+            }
+
+        // support cones
+        hull() {
+            cylinder(h = eps, r = boss_r - eps);
+
+            translate([side * (boss_r - 1), 0])
+                cube([eps, 2 * boss_r, eps], center = true);
+
+            translate([side * (boss_r - wall + eps), 0, - (2 * boss_r - wall)])
+                cube(eps, center = true);
+        }
+    }
+}