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I just purchased a Waltham Selfwinding watch marked B-251K on the inside of the case back. First of all, it is marked 25 Jewel on the face and 17 Jewel on the rotor, which I found odd but its nothing I haven't seen before, and that's where the trouble started. The watch runs, and runs very well. However, the rotor is wobbly and loose that it contacts the balance wheel at times in its travel. The rotor does not attach with a screw, but rather with a sort of sliding clip. I am no watch repairman, more of a tinkerer who has opened and successfully repaired and maintained a watch or two in my life. I'm beginning to think this might be the wrong rotor, but it appears to be a perfect match, even drops in perfectly, but it is so loose it practically falls out. Ideas anyone?