$fn=60;

include <BOSL2/std.scad>
include <boltsos_0.4.1/BOLTS.scad>

// Reduc 20x16
h = 40;
od = 30;
id1 = 20.4;
id2 = 17;

// Reduc
difference() {
    zcyl(l=h, d=od, rounding=2);
    zcyl(l=h, d=id2, rounding=-1);
    translate([0,0,h/4]) zcyl(l=h/2, d=id1, rounding=-1);
// Screw Hole
    color("red") {
        translate ([0,-10,-h/4]) rotate([90,0,0]) {
            DIN931("M5");
            translate ([0,0,2.2]) DIN931("M5");
        }
    }
}