Well, I bought this thing. It feels slippery. Actually, baby powder can be used instead. It feels almost the same. But I advise you not to use brand powder. In fact, the principle is very simple. Bicycles are better than domestic brands because their friction coefficient is relatively uniform. However, after being used for a long time, for example, after being stained with dust, the friction coefficient will become uneven because of many places and few places, so the fan cannot be turned on. In fact, the principle of card powder is that after being stuck on the card surface, the friction coefficient around the card will become the friction coefficient of that powder, so it can be reopened.

But after using it, I found that actually using brand powder to turn on the fan and using a new brand to turn on the fan are completely two concepts. After using the brand powder, the friction is much greater than that of the new brand, that is, the strength of turning on the fan will be much greater. If you use a brand powder to turn on the fan for two days, and then turn on a new brand fan, you will feel that the brand is too shiny and you are not used to it, so you'd better not use it. I regret it. ...