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With the barrel held in the vise, I would apply some gentle heat (like from a small, hand-held Bernz-O-Matic propane plumber's soldering torch) to the dovetail area.
After the work's had a chance to heat up a bit, then drive the sight base out using the drift pin, with a hard smack (not love taps) from a heavy hammer (1lb or more - like a large ball peen hammer, and not a household claw hammer).
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Last edited by PetahW; April 1, 2014 at 08:40 AM.
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