iron stick 大致应译为铁钎或铁杆(可能指做成特定形状的小螺丝刀之类)
The adjusting steps are as this : open the lead sealing, take away the adjusting ring, dip tightly screw, then using the small iron stick to draw the gear by dip into the screw.
大致意思是:
调节步骤如下:打开铅封,移走调节环,上紧螺丝,然后通过(把小铁钎)插入螺丝孔,利用小铁钎来拨动(牵引)齿轮。
铁棒,铁杵。