Another little trick I have used in the past is to take a GH2 tap and buff it (so it wont re-cut the thread) then screw the tap into the threaded hole, it locates on the pitch dia and you can use the O.D. cylinder of the tap for your measurement.
Another little trick I have used in the past is to take a GH2 tap and buff it (so it wont re-cut the thread) then screw the tap into the threaded hole, it locates on the pitch dia and you can use the O.D. cylinder of the tap for your measurement.