You can use a Dremel to remove some material at the top, where the holes where the screws come, it will come down a bit.

You can replace the piece of aluminum, which has the threads for this we must remove the back cover and desolder the circuit connecting coils, taking care not to much heat, then remove the piece is easy, this involved a little force, can put a old motor piece, with good condition.

I hope you can help. Luis C.