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Boing, before attempting to drill & tap try a new bead. After you get the shank filed down to the proper length to fit the present hole, put a little epoxy or locktite on the threads. That should hold it forever. If you don't want to go this route, do yourself a favor and let a gunsmith install the sight. If you don't have a jig it is very difficult to drill the barrel without the bit walking on you. By the time you pay for a jig, you could have a smith do it three times. As with most smithing work, it is very easy to do it wrong. George
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