Abstract: A seal for sealing a stirrer motor shaft in a microwave oven structure. The seal is provided by a bushing bearing journaling the motor shaft and receiving in a non-circular-hole in the wall of the cabinet defining the microwave oven cavity. The bushing is threaded and receives a threaded securing element cooperating with a shoulder on the bushing to clamp the bushing against the portion of the wall member of the cabinet defining the opening. The bushing is electrically connected to the wall member to define a ground for the motor shaft. The motor includes a housing secured to the bushing to be in spaced relationship to the cabinet wall.