hi all,
yes the plug works as decribed, above I think it is just a case of diferent terminology to mean the same thing,
the main problem that occurs as it seems to me is the inset gets twited in some cases and then the start point for plug insertion is wrong, the plugs outer sleeve in such a case would then be in the wrong place and unable to locate the 3 outer lugs on the socket to draw the plug in correctly,
unfortunatly while the design and fittment of the socket seems pretty standard, not all plugs are of the same quality or design,
while rewiring the car and van to 13pin, I had noticed the flimsy nature of the insert locator and method of attachment of the inner working of the plug purchased of e-bay. apart from the the small groove at the btm of the inside of plug there was nothing to stop the insert from moving in service, this was disergarded in favour of one from towsure that was more secure and smoother on operation allthough twice the price, even so I added a few drops of superglue to the insert on assembly to make sure it could not move,
since rewiring I have had no trouble with connecting the electrics at all it is super smooth and connects every time,
the very fact that some plugs come complete with a green cover/ realighnment tool makes me think it is a common problem though.