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You can tighten a dovetail sight by using a prick punch and dimpling the barrel. You don't need too many, generally less than 10 of them to be effective. Gentle too. It will raise a bit of metal, won't show and will tighten things up. Some gunsmiths have used a flat punch to hit the top thin edge of the dovetail to tighten a sight too, but that may leave a mark on the barrel as well.
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