[roverbarmy]

Originally Posted by macafee2

you don't go vertical but horizontal through the "large" round hole, see your first picture.
The short extension must be short and some standard short extensions are too long. Make sure the socket is a tight fit on the extension in case it comes off, it can be a cow to get out of the sub frame. I have even taped the two parts together.

macafee2

A dose of blutack helps!