I just drilled the hole where the chevrolet horn wire would go thru, routed the wire thru the spring and connected it to the contact ring, worked perfectly. If you look at the picture of the steering wheel, you can see I had to manufacture a filler piece as there was about a half inch space between the column and the steering wheel. Would you believe I found that the bottom of a quart paint can is just the right diameter and all I had to do was drill out the center hole, horn wire hole and the 3 stock steering wheel reducer holes found on the 50 steering wheel. it fit like a glove. I sanded it with a piece of scotchbrite and clearcoated it, looks like it was supposed to be there. Bud