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1. First use a screwdriver to loosen the two bolts on the gusset plate on the inner side of the door; 2. After the two bolts on the gusset plate on the inner side of the door are loosened, you can loosen the gusset plate, connecting rods and the outside of the door. Remove all the handles of the doo

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

1. Look at the appearance of the handleFirst, observe the surface color and protective film of the handle to see if there are scratches and damage. To distinguish the quality of the handle, first explore from the appearance treatment. The sand handle with good quality is the one with gray color and

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