Thanks everyone, for their input. Amphiman, thank you, I will let you know if it breaks, but I think I'm gonna buy a parts engine since I also need the charge coil (The original reason I started this) and now the crankshaft nut as well, and spare parts are never bad. The flywheel puller will thread into the steel threads in the flywheel just outside the crankshaft, that face in towards the crank. The reason JLO put them there is to pull the wheel. They never intended the aluminum threads for the starter cup to be used for pulling, but if you don't get a headache like mine, it seems to work for most people. Jimmy (Mogman) is designing it to be thick, and to take the force of a REALLY BIG breaker bar or ULTRA HIGH TORQUE impact wrench. When he gets it set up, and we test it (Trial by fire) he'll see if they are worth it, and if so, he'll be the one selling them based on what materials cost him and how long it takes.