The microswitch is composed of a top cover and a plastic contact, an internal spring copper sheet and a switch base.
The fault performance of the general micro switch is that the click triggers poorly and the click fails.
At this time, it can be solved by replacing the micro switch, if there is no replacement parts at hand, you can try to solve the fault by cleaning the micro switch.
With pointed tweezers, you can easily pick up the top cover of the micro-switch, remove the spring copper sheet, blow and erase the dirt that may exist on the base and plastic contacts, and grind the oxidation layer of the spring copper trigger point with sandpaper or printer paper, the cleaning work can be finished, and most of the switches can be restored to use.