DRT clutch GS150/SS180


I bought a clutch for a DRT-GS150/SS180. Now there are a few problems.

The bronze nut that the cogs hold  in his place  pushes against the cogs instead of the shaft, so the cogs block while still should be free to rotate?

By using the original nut, I can solve this problem.

The next problem is that the clutch cover does not close completely when I mount the clutch, both top and bottom (the clutch lever).

does anyone have the same problem and how does this solve?

ps I have mounted te clutch also on a GS150 motor , but I there the problems are the same. 

Greetz, Pieter.