Sumix SMX-150M - Manual (Page 85)

Trigger Connector
85 Basic Guidelines on Using of Trigger Connectors with Cables for the CommandShot Cameras
Figure 8-9 Gripping the main part of the connector with fingers
2 Fix the inner part of the connector with tweezers ( see Figure 8-5 Fixing of the inner part
of the connector with tweezers ).
3 Rotate tweezers counterclockwise.