Re-threading some stripped out holes in the tailstock thrust bushing on the G4000 metal cutting lathe.<br /><br />When I repaired the tailstock ram set screw, I also replaced the original set screws in the tailstock thrust bushing as the screw sockets in the original screws were shot. However, even with new M5 screws, the threads in the cast iron and steel parts were gone.<br /><br />So I ordered up a 3-piece tap set in 1/4-28 and some matching set screws. I had M6-1.0 and 1/4-28 taper taps, but I didn't have the plug and bottoming taps. I figured I would have more use for the SAE thread size taps so went for that over the M6 tooling.<br /><br />I left one M5 screw in place, then drilled/tapped the other hole, inserted the 1/4-28 screw and then drilled/tapped the first hole. I also put a witness mark on the bushing and tailstock body for future alignment. <br /><br />So far the tailstock is working like new. I may need to adjust the handwheel if it doesn't loosen up with use. But cost for the tap set and screws was about US$8.00, vs. buying a new tailstock body from Grizzly:<br />Replacement p/n: P40001012 TAILSTOCK BODY, 2017 cost US$85.25 <a href="http://www.grizzly.com/" target="_blank" rel="nofollow">http://www.grizzly.com/</a><br /><br />Be sure to rate, comment and share<br />And as always, thanks for watching<br /><br />Intro:<br />Louisiana Fairytale by Austin Rogers<br /><a href="http://drfiddle.com/show_tune.php?id=94" target="_blank" rel="nofollow">http://drfiddle.com/show_tune.php?id=94</a><br />...<br /><a href="https://www.youtube.com/watch?v=XhJH5zHk7e4" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=XhJH5zHk7e4</a>