Sorry for the troubles.
First, I want to reiterate (as I did on the thread you mention) that I do not believe there is ever a need to do anything with the circuit board. The center hole is not too small. Unlike the plastics, there is almost zero variance from the size and shape of the circuit boards from one to the other, so either they're all too small (they aren't) or they're all fine in that regard. Yes, I realize at least one person believed it was necessary to modify their circuit board, but I really do believe they were mistaken in what was the actual cause of the problem they were experiencing. How did you go about enlarging that hole?
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Art