McMaster-Carr has 16mm socket headed cap screws of sufficient length to put a nut and washer on, then thread through the balancer itno the crankshaft. It gets "just" enough thread into the crank to pull the balancer on. Hold the socket bolt with a hex key and turn the nut with an open end wrench. If it feels like it requires more force as the balancer gets near the bottom, back off the nut and turn the bolt deeper into the crank to engage more threads. This has worked twice for me. And i'm sorry, but i can't remember the bolt length i used, McMaster did sell them by the piece, however. I recall the shipping cost was more than the materials cost.