[ruudxd]

What do you mean with the holes are not available anymore?
That the treath is stripped?
Can't you tap a bigger size screw in it?
If not, then I would go for new FLM bulks because the plastic ones arent very good.
RPM has bulks now, but I like a drivetrain with very little flex, so aluminum would be my choise there.

For a Castle 1515 you can get rebuild kits, they include a new front and rear bell, rotor, and bearings if I am correct.
If you want to pull of the endbell, remove all the screws, and push the axle hard to a table or workbench, it should pop off then.
I have never seen a motormount that hold the end of the motor to.
Just the front should be enough.
Doesn't Mike have a motormount?