由于原滚轴太粗，有的小料不能套进去，所以拆除原滚轴，改用挡环挡住，用原装料时，反过来安装也可以兼顾到。材料选用TPU，方便套入。

Because the original roller is too thick, some small materials cannot be inserted into it, so the original roller is removed and blocked by a retaining ring. When using the original material, the reverse installation can also take care of both. The material is made of TPU, which is easy to insert.