So I should do what - tell him the theory that doesn't work and ignore the reality that answers his question?
The question was how to adjust the gap. With the (quite rare) proper length arbor pin the method of adjustment is to either shim the frame at the locating pins on the bottom or shim/trim the arbor pin. I don't consider that a better answer.
Ed: In rereading the above it sounds flippant. I don't mean to be, so apologies if my tone is offensive.
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