2. Remove the abrasive belt, and the gap between the back-end rollers of the bottom plate and the casing must not allow a 7 mm steel ball to fall into it. The gap now is too big to meet the requirements.
2. Remove the sand belt and the gap between the rear roller of the soleplate and the chassis requires that the 7 mm steel ball not fall in. Now the gap is too big to meet the requirements.
2. Remove the sand belt, and the gap between the roller at the back end of the bottom plate and the shell requires that the 7mm steel ball cannot fall in. Now the gap is too big to meet the requirements.<br>