several hours later and an intimate journey into the bowels of my gun I found the gearbox in excellent condition inside. the adjustment screw to set the motor depth backed off and the pinion on the motor got a little chewed but other than that, it is shooting fine. boy .... what a pain in the ars it was getting the gearbox out ,open and back together again. Looking online a new gearset was gonna run about $100. till need to replace the pinion in the motor though. is it replaceable? or do you have change the whole motor?