23-12-2020, 06:27 PM
I haven't worked on one for a long time, but I seem to recall that the thread is 3/4 x 16 TPI WF. If you don't have a thread guage You can check yours against a 3/8" Whitworth bolt which is also 16 TPI -it should fit snugly into the threads you have.
If you do need to buy a tap or die, 3/4" x 16 WF is identical to the obsolete imperial conduit standard thread. These turn up on eBay quite regularly and are usually a reasonable price.
If you do need to buy a tap or die, 3/4" x 16 WF is identical to the obsolete imperial conduit standard thread. These turn up on eBay quite regularly and are usually a reasonable price.