(Thus causing faster pot and output arm hole wear, component failure, etc.).

Gear replacement - Should you crash, (heaven forbid) be sure to check your servos for damaged gears. Immediately after retrieving your plane (or pieces) and before electrically operating the servos, grab the output arm and try rotating it. If it moves freely without rotating the servo's gear train then you probably lost a gear tooth. Now hook up your radio and hold a light pressure on the servo arm while you work the transmitter stick to maximum travel. A missing or damage gear tooth will be easily detected.

Gear replacement is an easy task in a servo. Usually the gear driving the output gear will loose a tooth. The gears next to the servo motor seldom get

damaged, but do inspect them all. If possible before taking the servo apart center the arm. Now when you take the case top off, look for the stop pin cast in the output gear. This is a mechanical stop that hits two stop points cast in the case. When you replace the output gear, its stop pin should be in the same position as the one you took off (centered between the case stop points). Also, the bottom of the output gear is keyed in some fashion to the top of the pot. This must be aligned before installing the gear. With the exception of the output gear, all other gears have no alignment position.

Indirect Drive Pots - In some servos the output gear sets directly on the shaft of the "feedback pot". In fact, early servos used the bushing of the pot as the lower support for the output gear. This configuration passes all vibration of the controls