The bushings are normally staked into place on the rear of the bushing, using a special tool that allows you to use a hammer to upset the portion of the bushing that protrudes into the mag well area of the frame after installation. You might find it takes a bit of muscle to remove the old bushings but damaging the frame is not at all likely. The new bushings just need to be threaded in, and I would use loctite to hold them in place if you do not have a staking tool. The worst thing that can happen is that when you remove the grip screw you unscrew the busing from the frame as opposed to the screw from the bushing. No biggie. I am sure that lots of .45's do not have their bushings held in by other than torque.
Willie
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