Fox Collectors

Now I'm trying to find out what size the rear tang screw is on my old Fox Sterlingworth. We think it's an 8-40, but it doesn't seem to fit an 8-40 die. Does anyone have the thread specs on that rear tang screw? Thank you once again!!

The screw we have need a few more threads and we need to know the size to get the right die.

I've never seen one that isn't # 10-32 American National thread.

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Silvers