The hole may be buggered up bro.
Using the back end of a matched size drill bit (same size as motors) Run the bit down the hole and see if it catches at the same spot as the motor. If it does speak with the distributor first. If that’s not an option hand drill out the hole. Yes it’ll be a pain, place 2 one inch pieces of pencil at back end of drill bit, tape across pencil, drill bit, pencil then around a few times. You have created a handle to help grip with. I do this for all bigger drill bits and hole saws bits especially for rc planes.