Review on Uxcell Miniature Thrust Bearings Washers Power Transmission Products for Bearings by Marc Gallner

At constant voltage, current and load, adding these bearings increased a machine's speed by a little over 3%. I have no way of measuring, but the sound has noticeably decreased. The car also shakes significantly less. All this just means that the engine and other moving parts wear out a lot less. The investment is definitely worth it! (The photo only shows the bearing, endless lack of space, probably not the best idea in the long run)