// Binding Post Bushing // rjkorn January 2015 $fn=100; difference(){ union(){ // Flange cylinder(d=30,h=3); // Conduit Sleeve translate([0,0,3]) cylinder(d1=22,d2=21,h=23); } union(){ // Center Hole translate([0,0,4]) cylinder(d=16,h=24); // Post Hole cylinder(d=6.5,h=4); } }