This tool was fabricated to allow the crank shaft to be rotated from the front pulley. After breaking the bolt off inside the end of the crank shaft and spending $70.00 to have a machine shop extract it, we wanted to make sure it didn't happen again. We were lucky the engine was on the stand and not already mounted. This tool is made of 11 gauge laser cut mild steel and a large 5/8" nut is Tig welded to the center. This tool is attached with three bolts which can thread directly into the front pulley. If one of these smaller bolts breaks, it is as simple as backing the other two out by hand, removing the tool and removing the broken bolt from the pulley by hand. The alternative is breaking the main bolt on the crank and having to deal with extracting it while the engine is mounted, or worse, having to pull the engine.