wheres a good source where i can find a clutch for a 5/8" bore shaft, that holds on with set screws, and will engage at a high enough RPM that it wont bog out on a 2-cycle engine? Specifically I would be using it on a Tecumseh powerlite snowblower engine. I tried putting a tighter spring in a Mercury clutch, but that didn't work out too well. I looked around, but all i could find was clutches for tiny goped engines online.