I have not used the foot pedal for about 4-5 months. It worked fine the last time I used it. I am trying to hook up the Maestro EX to a Gravermach AT #1 left side air supply to do some stippling. The foot pedal is leaking air. I have gone on GRS web site and followed directions for alignment. After alignment foot pedal still leaks a fair volume of air and the handpiece vibrates at all pressure ranges.