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If the anti-reversal latch would be broken and not working the piston would be slammed back at the zero position, the anti-reversal not holding the gears in place... It could be due to the trigger unit however, if the "slider" gets held in forward position more than it should it might be due to that too... In either ways, a MOSFET would probably solve your problem easily, if you plan of having it for a long time it's definitely worth it.
At this time there is some interesting threads about MOSFET around the forum, you should check it out if you want to go that way.
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