Originally Posted by
Black wallnut
Use a plunge cutting end mill to clean up the surface of the screw, then center drill then drill to tap drill size then tap. Using an endmill in a drill chuck is not ideal but in a pinch it can be done.
erileykc if you decide to go this route, I have several 5/32" four-flute square end mills that would be great for this - all halves of double end mills that I don't have any use for. You can come get them or I can put them in an envelope and mail them to you.