Screw the fixing ring nuts back on.
拧紧背面的固定环型螺帽。
Accessories package: protect ring, plastic cap screw.
配件包：护线圈及胶帽螺钉。
The holding ring and the secondary holing ring are connected through a screw thread.
扣押环与二次扣押环通过螺纹连接。
The holding ring and the secondary holing ring are connected through a screw thread.
扣押环与二次扣押环通过螺纹连接。
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