that happened to me once, the bolt that goes in the crankshaft snapped clean off, as well as part of the balancer that goes over the crankshaft snapped right off, i used a screw driver to take the end of the bolt off in the cs, and the drilled 2 holes on each side of the shaft on the broken part of the balancer that was still on the cs and pulled it off with the balacer puller, i'll try to get pics of it, its pretty amazing stuff