There is no need to control the rotational position about the axis of the bore, because up to the time when the holes are drilled, it is symmetrical about that axis.
由于直至钻这些小孔时，工件都对称于大孔轴线，所以没必要控制围绕大孔轴线回转的位置。
The connection portion connects the first and second bearing portions at a position opposite the gap with respect to the rotational center axis.
和设置在第一支承部、第二支承部或连接部上并构造成与所述安装构件接合的接合部，其中所形成的间隙使所述旋转轴能够通过该间隙。
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