I made this clevis for use on my son's power wheel ride on, so we could hook a wagon up to be pulled around. The design is setup for printing with supports, when printed, the shackle will pivot from the body. The body is setup for a 1/4-20 threaded insert to be inserted and epoxy'd in place ( similiar to how I have the xterra utili-hook: http://www.thingiverse.com/thing:1316809 ), and then I'll epoxy in a length of 1/4-20 rod to mount into the power wheel.