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Identifying a Parker Hale thread size.


I am modifying a Parker Hale back.sight to take modern eyepieces, The thread size is giving me some hassle as far as identification is concerned.
The diameter of the thread is 0.249 and the pitch is an excellent match to my 0 BA thread gauge..Unfortunately the diameter of an 0 BA thread should be 0.236 and indeed an 0 BA screw is a rattle fit in the threaded aperture.
I have some comprehensive books on screw threads, but I can t find anything that matches. Just wondering if Parker Hale had their own standards or is there a series of gunsmith threads that I am not aware of? ....

United Kingdom , Andrew Tinsley , Michael Gilligan , Parker Hale , Tony Pratt , British Brass , ஒன்றுபட்டது கிஂக்டம் , ஆண்ட்ரூ டின்ஸ்லி , மைக்கேல் கிலிகந் , பார்க்கர் ஹேல் , டோனி ப்ர்யாட் , பிரிட்டிஷ் பித்தளை ,