Help: Making a cable with plug on each end?

[qualar]

I am trying to make a cable with a plug on each end of the cable.  I have attached the plugs to each end using an attachment.  However, when i drag one of the plugs in the application rather than the plug at the other end been dragged along with the rope the rope just stretches and the plug at the end remains in the same place.

How can i get it so that when i pull plug at the start the plug at the end drags.  I want the cable to remain a fixed length.

Thanks in advance.