The correct replacement sequence is as follows:
1. Connect the air source, press and hold the switch, unscrew the barrel, release the switch and mold;
2. Find two small wrenches (corresponding to the opening size) and unscrew the claw jacket counterclockwise;
3. Pour out the claw piece and put in a new claw piece. The first installation will be a bit troublesome. You can block the cuff with your fingers, arrange the claw pieces in the sleeve and let it slide down slowly. Then, carefully put it back into the machine and tighten it with a wrench (not too tight).
4. Connect the air source, press and hold the switch, and screw the barrel in place. Try to pull out the nail
PS: Just to explain, when disassembling, press and hold the switch to disassemble the barrel. First, it is for assembly. Second, in order to avoid nail sticking, the nail pulling gun will return to the correct position without deviation.