Joe, This may be the wrong place to ask this and if so I apologize up front...... How can you tell that this is a "secondary" cluth? I don't understand how it/they work..... I have a Rupp here that's been around here forever, I have no idea where it even came from, it has a clutch on the jackshaft and I look at it and scratch my head..... Can you or anyone else spread some wisdom my way? Thank you, Patch