底部不光滑的石头会留下直线划痕，而底部光滑的石头则会漂移，偏离原路。
Stones with rough bottoms leave straight tracks, while those with smooth bottoms drift and digress.
改进时摒弃了利用标准上罗拉轴承外壳旋转来获取圆弧划痕以供调整的方法，采用了平面直线调整法。
Aclinic adjustment method is used instead of the conventional way, the arc trace is gained through rotation of the shell of the top roller bearing.
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