We made an aluminum keyboard with more than 400 hooks, and the chip often jumps, which is a headache. Later, we mixed alcohol with stamping oil and sprayed it on the sheet metal during stamping, which solved the problem. However, the key to this problem is to look at the mold. If the mold is good, it is not easy to jump the chip. But it's all open, so it's impossible to reopen the mold. We have to try to spray something.