It is still on this temporary switch. However, I want to move it back to the steering wheel. This is where the confusion starts, having never seen an original working horn set up, I am not quite sure how it goes. I understand that usually a negative goes from the horn up through the bottom of the steering column where the wire then clips onto the upper part of the steering column, which then somehow goes to the horn push and the horn ring is involved.
My setup has the wire clipping to the column, but I cannot find the other end of the wire.
The horn ring appears to have nothing to rub against, or at least I don't know what it is meant to rub against.

The actual horn press has two metal tangs but nothing is attached to anything

with a single bare wire coming up from the horn ring.

All semi simple so far.
However, my van also seems to have a completely different system which also appears to be original.
Attached to the horn is a positive and negative which both go together into sleeving which in turn goes into the sleeving that the headlight wiring goes into. This travels across the front of the cab then into the body to appear behind the fuseboard. The negative wire then travels across the dashboard and up into a wiring connector that plugs into the steering column- its the brown (with blue) wire. I have tested this and earthing it does sound the horn.


However the lug that this should connect to is missing

This next photo shows the square-ish hole at the bottom that the lug would appear if it was there

Does anyone know if there was more than one system used by VW for the horn? Or has someone elaborately made up a new wiring harness for the van at some point in its life?
Does anyone have any photos of how things are connected at the horn ring etc?
All help greatly appreciated.