cliprecess_h = 16;
total_h = 45;
-back_gap = 10;
-main_th = 2.5;
+back_gap = 12.5;
+main_th = 2.75;
tube_th = 2.25;
midweb_d = 3;
join_cr = 7;
+tube_rear_extra_th = 1;
+
// calculated
lockshaft_r = [1, 1] * lockshaft_dia / 2;
module MainPlan(){
difference(){
union(){
- circle(r = tube_or);
+ hull(){
+ for (t=[0, tube_rear_extra_th])
+ translate([0, -t])
+ circle(r = tube_or);
+ }
translate([-back_ohw,0]) mirror([0,1])
square([back_ohw*2, backflange_ymin]);