+module Jig(){
+ difference(){
+ union(){
+ translate([0,0, -side_height]){
+ cylinder(r= main_dia/2 + jig_thick, h= side_height + jig_thick);
+ }
+ translate([-jig_mark_rad, 0, jig_thick - jig_mark])
+ cube([jig_mark_rad*2, jig_mark, jig_mark]);
+ }
+ translate([0,0, -side_height-1])
+ cylinder(r= main_dia/2, h= side_height + 1);
+ translate([0,0, -10])
+ cylinder(r= main_dia/2 - jig_rim, h=20);
+ translate([0,0, -rivet_posn])
+ rotate([90, 0,0])
+ translate([0,0, -100])
+ cylinder(r= jig_hole_dia/2, h = 200);
+ }
+}
+