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This is what I have found so far; the hole size is the same as a 10x32 screw/tap, and I can confirm this with a decimal # drill bit which fits perfectly. The threads per inch do not match up with a 10x24 because there are more teeth on the remaining threads of the screw than that, and a 10x24 screw does not fit even the first turn. A 10x32 screw has the same issues and binds up as it is turned - it has more threads than the original screws I removed. This leaves me to believe I am looking at a 10x28 tap and I can not locate one in any of my catalogs. At this point, it's still a guess?