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Picture of How To Install A CGB With No Help
Installing a cable grip in a floor usually takes two people. One feeds it in while the person inside screws on the locking ring.
This instructable shows how one person can do it easily.

Step 1:

Picture of
Bend a hook on the end of a wire/rod then bend the wire into a horseshoe shape.
Place the locking ring over the hole to be used.
 
Very nice...I've been a union electrician for years and never thought of this...Thanks