This is on a body that has the holes pre-drilled for that specific bridge right?
If so, they should go in very snug but don't need hammering.
When I helped a friend build his VIP, it was drilled for the 510 one piece bridge. It fit in perfectly by applying steady pressure, but we did not use a hammer!
Just think what would happen if you missed! :tard:
If I remember right, we put a guitar pick on it side and used it with a chunk of wood to push it in.