Thread: Lathe

Yes not a big gear and welder mate is screwing nose up, but will step up if I can't get another( he just doesn't know it yet) Want to do a bit of thread cutting so slow stuff ups cause less problems than fast.
Not like any roll pins I've seen. The half that sits in the pully part has no splits yet the other half has 2 or 3 that look stress related. Not the usual full length split on standard pins. Also very lite weight. Or are these special ones used in a lathe?