If a new shim is prepared, the shim shall not be made of materials with large extensibility such as aluminum plate, and the number of shim under each foot shall not exceed three.
If a new sizing block is prepared, the sizing block shall not be made of aluminum plate and other materials with large extensibility, and the number of sizing blocks under each foot shall not exceed three.
If a new shim is prepared, the shim blocks shall not be made of materials with high extensibility, such as aluminum plate, and the number of shim blocks at each bottom foot shall not exceed three pieces.