How many variations are there for the hole in the No.5 MKI bolt handles?

I see mention of a more 'standard' hole used for BSA & Fazakerly production from 1946-1947, and of "early" bolts having a larger hole and, finally some reworked (in the 1960's?) that have had the holes enlarged.

What is the size of the "early" hole, and when were the reworked holes done?
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