8.4.3 Fragile Plastic Gears

At least in inexpensive R/C servos, the plastic gears are fairly fragile. A competition robot can easily break these gears. Although replacement gears are available, it is still a hassle to have to repair a servo. This is especially the case when the mechanism is difficult to access.

More expensive R/C servos use metallic gear and ball bearing for the main shaft, which significantly improves the longevity and reliability of the device.