To prevent damage to the sensitive
fiber end-face, always insert the fiber connector`s ferrule at an angle, with the connector key properly aligned to the receptacle notch.
When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler.
Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch ("right-hand orientation rule").
Gently screw on the connector cap
nut onto the receptacle until it is finger-tight.
Gently tighten the fiber grub
screw to reduce the free play of the ferrule in the receptacle.