[Serum]

Sounds like the controller might have survived. But it's hard to tell actually.

Can you shine with a light inside the mounting holes to see if you damaged some copper? (arh well, i am pretty sure you did, since it didn't worked with the long screws in)

Check if the motor runs smooth without a pinion, and turn it by hand. it should feel without any resistance. Then put to two of the three wires together, and see if it's getting more resistance.