将橡胶密封索环推进孔中。
然后，再向下把扣索穿过喉环。
把扣索向下从外到内穿过外侧的颊环。
Pass the snap down through the off cheek ting from outside to inside.
把扣索扣在外侧位于稍上方的笼头环。
从内到外把扣索穿过外侧的颊环。
Pass the snap up through the off cheek ring from inside to outside.
如果使用方法一的话，把扣索从外到内穿过内侧的颊环。
In method one, pass the snap up through the near cheek ring from outside to inside.
如果使用方法一的话，把扣索从外到内穿过内侧的颊环。
In method one, pass the snap up through the near cheek ring from outside to inside.
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