That doesn't sound right to me. The frame pocket for the bushing is set to a determined depth for the bushing, and the bushing should not go any deeper into the pocket. There are special tools used to remove the old bushing, ream the pocket to remove any burrs (the reamer does not cut the pocket deeper), a special tool used to insert a new bushing in the correct relationship with the hammer nose, and finally a crimping tool to crimp the edge of the pocket around the new bushing.