It was probably a case of one of the parts inside the JC coming loose as they do from time to time. The parts diagram that comes with the authentic is all over the place and you probably could have just taken the deck apart and reseated everything easily. Anytime you mess with the 510 pin, theres a chance that parts #9 and #10 will come loose, and unless you took the atty apart and threaded it wrong (or it was done wrong at the 'factory'), it would be very hard to actually strip the deck threads that go into the base.