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目前紧固圆螺母的工具一般用钩形扳手,其最大缺点是只能间歇动作,即扳动一定角度后,必须离开螺母,换一个角度使钩头卡人螺母上的另一个沟槽后
At present, the tool for fastening a round nut generally uses a hook-shaped wrench, and its biggest disadvantage is that it can only intermittently move. After pulling a certain angle, it must leave the nut and change another angle so that the other groove on the hook nut