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Not sure what you mean by "the middle cam bolt" but I'm was referring to what RIDGID calls the "Eccentric Lever" which is referred to on page 23 of my 3612 Owners Manual under the portion that deals with checking for parallellism. All I can say is it has always worked perfectly fine for me whenever I have needed to use it to adjust or fine tune my saw.
As for the thread size of the trunion bolt, why not just remove one and take it with you to the hardware store?