No32 Mk3 Thread question.

[Roger Payne]

I am currently getting ready to rebuild several No32 Mk3 scopes, but I am short of some of the 'cap & plug' screws that locate the brass shoes which in turn locate the grat block for the purposes of eliminating backlash. I had assumed they may well be the same as the thread on the screw that fits into the bottom of the clicker plunger housing on Mk1 & Mk2 scopes (1/4" Model Engineer), but it isn't, it's a little larger. At a WAG I think it could be 9/32" ME, although even then there is both a 32 TPI & a 40 TPI version.

It is in effect a screw within a screw, although I don't think the inner thread is too crucial, & I'm sure I can sort that, but the outer screw thread is frustrating me!

I don't have a problem making them, once I have the correct info. I checked the 1971 EMERS for the L1A1 scope, & whilst brief reference is made to the component, the thread is not mentioned. It's pretty nerdy stuff, so I doubt very much it'll be in most texts, although I shall continue looking. Anybody out there know off the top of their head??


I would be eternally grateful for any assistance!

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