Now I don't know how it works, Jason. Can we have another pic that shows the left end of the shaft, please, plus the center of the pulley, and a closer view of the right hand end of the drive bearing housing (that's the part the Allen screw is screwed into)? I don't know how the pulley is supported, and I don't know what supplies the clamping force for the clutch, or what disengages it.
Your clutch friction material is severely glazed, indicating it has been slipping, as you said. This was probably due to insufficient clamping force - either due to wear, or maladjustment. Since I don't yet know how the clamping force is supplied or adjusted, I can't tell which. The friction material is usually cork, which is indeed the usual material engine sump and rocker cover gaskets are made from. I think you can probably buy it from an automotive shop such as Repco.
