1. Find the special wrench for replacing the cutting piece. There is a fixing block with four holes on the cutting piece.
2. Align the wrench with the hole on the fixing block and loosen it counterclockwise.
3. There is a small button at the back of the cutting machine, which needs to be pressed to unscrew the cutting blade.
4. After unscrewing, remove the fixed block and the old cutting piece, and install the new cutting piece.
5. When tightening the fixing block, press the button at the back.
