It needs an open backplate to prevent an hydro lock and it also need to support the conrod so it will stay on the crank pin. Many brands and model engines arround with all different dimension back plates. Time to make an universal back plate.
The 2 parts
How it will be mounted in the engine
A clamp construction will keep the support disc on its place
Enlarged mouting holes for different crank cases (sadly my rotation table has some play)
A look inside the engine
