MP,
Without a doubt one of the very best persons to rebarrel a highwall is right here (at least sometimes). Glenn Fewless understands how to barrel a highwall like few other folks. He can fix your pin too. Lots of methods for doing that. Drilling it out and replacing the tit with a roller bearing, S7 Steel, or spring wire are all well recommended by many accomplished shooters.

Brent


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BrentD, (Professor - just for Stan)
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