1. After using for a period of time, the door handle is prone to loosening. If you call a professional maintenance worker to repair it, a fee will be unavoidable. It's better to solve it by yourself at home, just adjust it tightly.2. The specific method is very simple. First, unscrew the cover outsi

1. There are two kinds of rotary door handles. If you can see the fixing screws and if you can't see the fixing screws from the outside, first remove the fixing screws at the lock tongue.2. Remove the lock tongue, and then remove the screws on the baffle in the room. You can see the internal fasteni