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Check the bolts on the flywheel and pressure plate. The person is correct on a shouldered bolt. He isn't correct in the name, but what he is trying to say is that the bolt must have a shank that is long enough to go through the pressure plate. A fully threaded bolt is not to be used. The contact area is not the same and the pressure plate can move. My other thought would be flywheel bolts. I would check them both. The transmission input bearing should have acted up in neutral with the clutch engaged(pedal out) and the vibration should stop if the clutch is disengaged(pedal in). Bolts need to be Grade 8. They sell them at most auto parts stores with a Mr. Gasket line or similar.
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