Decided to use this mech on my own bike but there appears to be a bit missing behind the fixing bolt. Does anyone have one or know any cheats to get over the fact that its not there?
I think there should be a narrow washer with a tab sticking out in both directions as a stop to hold the arm from going forward, and allow it to swing back to remove the wheel. I had one somewhere from the later but slightly similar titanium version.
Looking at the pic agentorange posted (that was well found!), it appears you have the bolt section and are just missing the steel plate and adjustment screw. Maybe something can be adapted from an old mech?