1. First, you need to align the wrench with the hole on the fixed block of the cutting machine and loosen it counterclockwise, as shown in the picture.

2. What should be noted here is that there is a small button on the back of the cutting machine. This button needs to be pressed before the cutting piece can be screwed out, otherwise it cannot be screwed out.

3. After loosening, take out the cutting machine fixed block and the old cutting piece, as shown in the picture below.

4. Then install the new cutting blade and tighten the fixing block. Don’t forget that the button at the back still needs to be pressed.

5. Finally, the portable stone cutting machine is completed by replacing the grinding wheel, as shown in the picture below.