Greetings. Does anyone know what the thread size is for the tang screw on an early british made parker hale whitworth? Need to find a suitable replacement. None of the screws (standard or metric) at my local Ace hardware seem to match.

Also, would the same screw size work for their enfield and volunteer rifles?

Does anyone have an expoded parts diagram for these?

This is a British made Parker Hale, not an italian one.

Lastly, does anyone have a platinum lined nipple for same (5/16 x 18? Looking to buy one. Buffalo Arms, per phone call, is out of that particular size.

Thanks!!