Edgars method may be more effective for stubborn lock plates but what I am usually able to do is pull the lock plate bolt from the left side and screw it into the threaded hole on the outside of the lock plate on the right side. Pull on and wiggle the screw to pull out the right lock plate. Then use a brass punch to knock out the left side. Be very careful not to chew up or dent the thin wood along the edges of the lockplates.
If I did need to use Edgars method I would use a plastic hammer to tap on the top of the lock plate bolt. A punch may mar the engraving.
Good luck,
Kurt
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