As the contact arm and trigger inner lever wear, the trigger will not push the trigger valve pin all the way in. The pin on the trigger valve also wears. One deficiency or a combination the three problem areas is causing the problem. Remove the trigger and look carefully at the inner lever (thin metal part ). If it looks rather worn and the trigger itself fits loose on the retaining pin, replace with new. Replace the trigger valve if the center pin seems loose in the valve and looks like it has worn shorter. ;Good luck.
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