Williams Western peep windage screw size

[Bendejo]

I've been trying to get my peep sights installed for the upcoming Muzzleloader season but the damn slotted screw for the windage lock up on my Williams peep site sheared off. Anyone with some mechanical or Machining skills that can tell me what the thread pitch of this screw is?

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[Mighty Mouse]

The one on my sight is a #4-40, 1/8" long.

 

[Bendejo]

Thanks mighty mouse!

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