1 First of all, you need to prepare suitable tools, such as knives, files, sandpaper, etc.

2. Secondly, cut the hard plastic with a cutting knife, and try to cut along the edge of the part that needs to be removed. Then use file and sandpaper to polish, so that the hard plastic surface is smooth, burr-free and angular, reaching the required shape and size.

3. After removing the redundant parts, it is necessary to clean the surface with clean cloth or clean water to keep the surface dry.