Model No. 3 roller diameter

Hi all; could someone with a Model 3 platen press please tell me the roller diameter? From putting a straight edge between the two runners when there’s type in the chase, it seems that it must be slightly less than the diameter of the bearers (as in the attached photo). I *might* be able to work it out, but if someone has some they could measure for me, I’d be very grateful.


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