Put transversely the lock nut into the annular notch of the hole saw connector( see Fig.2), install the lock nut together with the hole saw connector onto the spindle of the pipe driller, and then fasten it with a crescent spanner.

• 先将锁紧螺母沿横向卡入孔锯接头的环形槽中（2）再将锁紧螺母连孔锯接头一同装上钻孔机主轴，用月牙扳手扳紧。