Have you ever noticed that a main jet that has been in the bike for quite some time will begin to wear on the threaded side. The motion of the needle going in and out of the brass jet will deform the pefectly round hole and make it slightly larger and egg shaped. I noticed this while making some jetting changes today, and I compared a few jets that I have run for a while with ones that I haven't. My question is, does the deformity of the hole on that side of the jet affect the jetting to a measurable degree as it wears. It would seem that as the hole wore bigger, it would let the main jet begin to come on a little sooner. Does that sound right?