定位螺丝又称为支头螺丝、紧定螺钉
松开固定时间子午线指示环的定位螺丝。
Loosen the setscrew that secures the ring with the time meridian indicator.
第二种适用于特殊全封闭的轴承，其一头有间隙并有定位螺丝孔。
The second applies to a special closed-wide bearings, which have a gap and a positioning screw holes.
很多时候(与小齿轮)，你将需要删除的小定位螺丝(通常为3毫米)已拧紧尽可能。
Many times (as with pinion gears) you will need to remove small setscrews (typically 3mm) that have been tightened as much as possible.
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