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Actually thinking of this 50 is a lot mechanical, the most I ever saw on a plate so far is 18, check that the retaining clip under side of the mounting plate is intact, it is three prongs with a slot that go over a post to let the pickup pivot on vac. I have a dist machine and have seen a few broken off and it does strange things to the advance if it is ley me know I prob have one you can have.