When I fitted the mk4 Golf steering wheel into the Caddy I did not seriously attempt getting the centre horn push to work. I had got used to using a horn button on the dashboard, and given the (mostly self-inflicted) difficulty I had getting the wheel fitted, I had no reason for expecting that the horn push would be straightforward. Then one day I was in the workshop doing something else when I noticed that the gap between the rear face of the Golf wheel and the sprung horn contact might just be conducive to a simple fix. I had a standard Felicia wheel in the garage, and it took only a couple of minutes to remove the horn contact ring from that, and barely longer to size it up against the gap it needed to fit into and confirm that it looked about right. Good enough to take the wheel off and have a closer look. Both the Golf wheel and the Felicia contact ring have three unevenly spaced mounting holes, which looked as if they were at approximately the same spacing, but the holes are not on the same PCD so I could not simply bolt them together. All I had to do to get round this was to open up the holes on the wheel a little with a drill, and then use flanged screws to attach them together. With that done, in classic Haynes manual style, reassembly was a reverse of the process involved to take it apart. I retained the dashboard mounted horn button as well, partly because it was there already and there was nothing to be gained from removing it, but mostly because my eldest grandson likes to go in the workshop and sound the Caddy’s horn, using that button, so I definitely do not want to spoil his fun.