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Yeah. I'm feelin' kinda irritated with the whole thing at the moment.
I'll probably just go away and try not to think about it for a while.
Assuming you cut the taper so that the flange diameter is intact, then the diameter of the face of the wheel is already a bit smaller. But cutting the proper taper won't change that; only the flange diameter will end up being reduced. Based on this and the drawings, I calculated that the wheels are smaller by .049" than per plan.