Hey thought id share things since most race or drift guys have to do it alot. Iv used other tricks for years but to keep the flywheel from spinning on the KA motor i found you can take a pressure plate bolt and a 10mm craftsman wrench and its like a clicker in your seat belt lol. You can lock it to tighten or lose. Hope this helps.. i used other wrenches and no go but you can use the same idea on other blocks maybe.. good luck
