How do I lock this clutch so it does not rotate? I am trying to disassemble to find a way to re-insert this small pin (shown in pic- I cannot find ANYPLACE beneath the top plate shown with hole that it fits into). Even if back tire is held in place, the middle bolt shown in clutch rotates (I am trying to lock in place to loosen). This has to be a newbie question, so any help appreciated- thanks.