translate([ratchettoothsmoothr+0.5, armendwallthick/2, 0]) minkowski(){
rotate([90,0,0])
cylinder($fn=20, r=ratchettoothsmoothr, h=armendwallthick);
translate([ratchettoothsmoothr+0.5, armendwallthick/2, 0]) minkowski(){
rotate([90,0,0])
cylinder($fn=20, r=ratchettoothsmoothr, h=armendwallthick);