Is it a USA model? Worker dropped my new Milwaukee screw gun 6' on the concrete. Won't run. Got power all the way though to the motor. It's a china model.jwoodcraft said:1/2" corded drill - runs intermittently. Pumping the switch makes some difference, but cuts in and out regardless of switch position. I have replaced switch, used different quik lok cords, & changed the brushes. Any ideas?