Bearings
Plane thrust ball bearing (pressure bearing)
The planar thrust ball bearing has three parts. The upper and lower parts are each a gasket. The upper gasket is smaller than the lower gasket, and the middle piece is the same size as the lower piece.
Installation steps: first install the lower piece, then install the ball and the cage, and finally install the upper piece, the upper piece can fix the shaft and drive the shaft to rotate.
Note: The inner diameter of the flat bearing is one standard and the other is too large. (such as 51104, one standard inner diameter 20, the other inner diameter is about 22)