My son removed the knob. I tried putting it back with spring inside but is not releasing the air or is not causing pump to kick in. one of the gages said 100 and the other one was zero. when I tried to blow air from hose there was nothing. The knob does not seem to work. I do not know if there were more parts. spring is just loose inside the knob, not attached to anything. Any advise. It is Camble Housefeld 13 gal compressor, model WL650102AJ

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