Paul,
The bezel does not hold the lock in at all. It's purpose is to hold the rear lock housing in place. The bezel is an odd shape on the inside and you can just jam a chisel or large screwdriver inside to tighten it up with. The lock is retained by the forward-most wafer in the lock cylinder. You depress the wafer and slip the lock in place, and the lock will stay in place. Be sure that the wafers are pointing up when you install the lock, or you will never be able to remove it again! There is a small hole in the top of the lock body, right at the door, that you can insert a paperclip in and release the wafer that retains the lock. If you install the lock upside down, you can't get at the wafer!.
Regards, John McGraw