Yes, undo the bolts. I take it you have a problem due to water having sat in the housing, looking at the rust. Worth fitting a new one, maybe, have a close look at the plastic element anyway.
Yes the engine sat for some time with water in the boat and caued the engine to cease and would not turn
I emove it from the boat so I can strip it down to fix it.
I have not come across a drive plte like this only the type like a clutch plate without friction material bolted to the flywheel with shock springs just like a car clutch plate
Thanks for the info now I an at home I can investigate further and get it bak working