Bearings are what allow the gears to rotate easily. They are generally designed outside of bronze or brass, and they suit into races (or grooves) while in the gearbox housing. In essence it consists of a metallic plate with mesh-kind inserts that stop contaminants from coming into the transmission and https://fernandoesnhy.pointblog.net/an-unbiased-view-of-filter-gearbox-77922623