For that then, is a bit more difficult but not hard. Remove the bottom plate on the pistol grip. There are two screws holding it on. Do not turn the large button type screw in the center! Remove the wires on the motor, they just pull off. Careful not to bend them. Then turn the grip upside down to let the motor slide out. Once you have the motor out you can look down the inside of the pistol grip. There are two screws at the bottom. They screw into the gearbox and thus secure the grip to the gun. Those screws have become loose and will require tightening. Tighten screws and reverse steps to put grip together. Careful when placing the bottom plate back on, make sure that the wires are not crossing over the center of the motor where the circle is. This will prevent them from being pinched when you tighten down the bottom plate.
