tinkerfive Posted January 30, 2012 Report Share Posted January 30, 2012 I've got this receiver that was previously D&T'd, apparently by hand and get this for #4 screws. Using my jig the front holes were close enough that they cleaned up nicely when I re-D&T'd for standard #6-48 screws. The rear holes however were right of center and to the rear such that once the rears were re D&T'd there is no thread engagement from 3:00 to 6:00 because the holes now are egg shaped where the fat part of the egg is the #6 screw hole and the pointy part of the egg is where the #4 screws were. I have #8-40 taps. I'm kind of afraid that if I go ahead and replace the #6 holes with #8 holes that I still won't have thread engagement from 3:30 to 5:30. If I use a 1 piece 3 hole base am I OK as is with the #6 screws? Should I turn the 3 hole base into a 4 hole base and have 2 rear screws in egg shaped holes rather than 1 rear screw? Should I turn the 3 hole base into a 4 hole base AND drill the rear holes to #8 ? Looking forward to the wisdom that I know is here. Tinker Quote Link to comment Share on other sites More sharing options...
ken98k Posted January 30, 2012 Report Share Posted January 30, 2012 I would weld up the holes and start over. Since we're talking rear bridge, re-heattreat would not be needed. If you get the holes tiged it would make no difference anyway. Quote Link to comment Share on other sites More sharing options...
Spiris Posted January 30, 2012 Report Share Posted January 30, 2012 I would weld up the holes and start over. Since we're talking rear bridge, re-heattreat would not be needed. Sage advice, and it will take care of the misalignment and egg shaped holes. Just make sure that you clean up the underside of the rear bridge of any slag that may be there, with a small riffle file. Spiris Quote Link to comment Share on other sites More sharing options...
pacrat Posted January 30, 2012 Report Share Posted January 30, 2012 I'd go ahead and drill it for 8-40 and see if it cleans up. If not you can always weld later. JM2c Quote Link to comment Share on other sites More sharing options...
rustvyper Posted January 30, 2012 Report Share Posted January 30, 2012 I had a similar reclaim once. The screws engaged, but they were a little wobbly & I knew they wouldn't hold for the long term. I filled the holes with job weld, waited for it to cure, redrilled with a 7/64" bit (slightly smaller than the #31) & the ran the 6-48 tap through. A little blue loctite on there & they haven't budged in literally hundreds of rounds! Quote Link to comment Share on other sites More sharing options...
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