topeak-mtx-tortec-expeditionrack-adapter: strengthen bolt (no angle)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/topeak-mtx-tortec-expeditionrack-adapter.scad b/topeak-mtx-tortec-expeditionrack-adapter.scad
index e11b591ab46d9872fb1cca1fc3e4f829aeb40e66..1b2355b177481f8edb70ebc500da5eb40922ae02 100644 (file)
--- a/topeak-mtx-tortec-expeditionrack-adapter.scad
+++ b/topeak-mtx-tortec-expeditionrack-adapter.scad
@@ -25,6 +25,7 @@ front_elevation_nominal = 3;
 cross_rail_distance = 232.09;
 
 general_gap_y = 1.0;
+support_bridge_gap_z = 1.0;
 
 strap_w = 8.0 + 1.0;
 strap_th = 2.5;
@@ -233,9 +234,10 @@ module BoltHole(){
     circle(brk_nearbolt_recess_dia/2);
 
   linextr_y_xz( -100, brk_bolt_nut_top_y ) {
-    circle( r= brk_bolt_nut_r, $fn = 6 );
-    translate([ 0, brk_bolt_nut_across_flats/2 ])
-      circle( r=brk_bolt_nut_r/2, $fn = 4);
+    hull()
+      for (dz = [0, support_bridge_gap_z])
+       translate([0, dz])
+         circle( r= brk_bolt_nut_r, $fn = 6 );
   }
 }