Remove the regulator from the door assembly. For all doors except the rear, drill a hole through the regulator sector gear and backplate, then install a bolt and nut to lock the sector gear in position, ensuring the hole is no closer than 7/16 in. (11mm) from the edge of the sector and avoiding drilling through the lift arm attaching portion to maintain joint integrity. Use a ¼ in. (6mm) bit to drill out the ends of the motor attaching rivets, then remove the motor and any remaining rivet portions from the regulator, noting that one rivet will be inaccessible until assembly for the rear doors. Position the new motor to the regulator and, with assistance, install new rivets by collapsing the rivet ends with a ball peen hammer. For all doors except the rear, after installing two of the three rivets, remove the bolt securing the sector gear to the backplate and use an appropriate electrical source, such as the vehicle's window motor harness, to rotate the regulator for access to the remaining rivet. Grind off one sector gear tooth from the side that does not contact the driven gear using a flat nosed rotary file to reach the remaining rivet, then remove the old rivet and install the new one. Finally, install the regulator back into the door assembly.