Not sure which forum to post this question, so I'm asking here.

Where can I find the actual front to back dimensions in either inch or metric specs on the 0, 1, 2 and 3 numbered bolt heads for the No. 4 MK I?

I have a #4 with a 2 marked bolt head that I think is slightly out of spec. It measures from .633 inch to .636 inch as you measure it at different points (front face to back shoulder on the threaded end).

Haven't found any dimensional specs in the manuals I have here.

Thanks for your help.
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