Yamaha SHO/SVHO Supercharger Clutch holding tools makes changing out your supercharger clutch fast & easy. This tool allows the lower supercharger drive gear (on the crankshaft) to be held in place while the main gear bolt is easily removed. Using this tool can save at least 1-2 hours in labor when changing out the supercharger clutch. A must have tool to do the job right, save time, and avoid damaging expensive parts.