Dryfire with snap caps.
Locktite will work, just don't over do it as it seeps everywhere.
You can also try deforming the outside of the bushing. Tap it with a hammer to make it out of round. This would make it tighter and harder to move.
Since it's a old gun, I'd do the locktite trick also, make sure everything is perfectly degreased before using the locktite.
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