+ cylinder(r = stab_tube_d/2, h = stab_tube_l + stab_tube_off + fuse_tube_d/2 + wall + eps, $fn = 6);
+ // pulley
+ translate([fuse_tube_d/2+wall, 0, stab_tube_d/2+stab_tube_wall])
+ rotate([0, 90, 0])
+ rotate([0, 0, 90])
+ cylinder(r = pulley_d/2, h = stab_tube_off, $fn = 6);