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Re: Rear sight base threads
Posted by Pete Nelson on Tuesday, 15 February 2011, at 6:59 a.m., in response to Re: Rear sight base threads, posted by Ernie Brandt on Monday, 14 February 2011, at 10:50 p.m.
Good morning Ernie,
NO - - I was not at all advocating using a #8-32UNF Tap and re-tapping the hole(s) - - just (in a pinch) using a button-head or filister-head #8-32UNC-2A cap screw of the appropriate length as a substitute for the original. That usually involves chucking up the Screw and then hitting it lightly with a jeweler's file or rough emery cloth to loosen the fit slightly. The main problem is that the hex-drive socket on the button heads is pretty small and the hex-wrench may not be able to take the torque without stripping the hex. My Grandpap Nelson also had a huge handmade wooden machinist's chest filled with every conceivable tap, die, E-Z-Out, jeweler's file, etc., and - - just like your Dad's - - it ended up going out some door when he passed away.
I made a few TRAPDOOR displays for the OGCA Annual Display Competition in Wilmington, Ohio about 4 years ago, and one involved a mock-up made from an old shot-out carbine barreled action (courtesy of the Good Dr. Frasca), and both of the 0.157-26 Rear Sight holes were damaged. I just used a #8-32UNC tap which I shortened to make a bottoming tap. It took a lot of hand working, but I got the button-heads (which were a dark-blue/black finish) to work quite acceptably. The best thing to do is treat the holes with respect right from the beginning and either leave the Sight and Sight Screws alone from the outset or, if the Sight must be removed, use extreme care and then keep the holes clean and well-lubricated (hindsight is a wonderful luxury, ain't it!).
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