Key jam is a common problem in Alps, but it is not too serious. For example, a card like a cheap film keyboard, if unbearable, can only be opened and cleaned. Apls has not been disassembled, so it may be simpler than cherry. Maybe you can try a can of rust remover, 10 yuan, so you don't have to disassemble the shaft, which can perfectly solve the contact problem of mechanical keyboard. Button Caton hasn't tried it. Here are just some ideas.