Originally Posted by
John Bly
The thread size is 1/4"-24 and MSC Industrial Supply(mscdirect.com) has taps for about $24.00. That said, it may not work as the original threads are a Whitworth style with a rounded crest and root. If you run a tap thru the threads you may have to make a new screw or buy one from Lodgwood or S$S. The replacement screws they carry are modern thread style( not rounded crest and root) and they are dead soft. Their screws should be case hardened for long wear. Good luck, if you need more help, send me a PM
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