一种带有弧形头部的扳手，通过一个圆销（有时是一个钩子）与谐振器啮合。钩形扳手用于拧紧相邻的谐振器。详情 ……
A wrench with a curved head that engages the resonator via a circular pin (or, sometimes, a hook). Spanner wrenches are used to tighten adjacent resonators. Details ...
