[pjmoreland]

I had a Grant steering wheel, and I found it particularly difficult to keep the brass plunger, spring, wire, and plastic cap down in that plastic tube on the cancelling cam while installing the "Post Cover" over it. I found that it worked well to put all the little components down in the plastic tube, fish the wire through the hole in the Post Cover, and then insert a slender screwdriver through the hole in the Post Cover to hold the little components in while sliding the Post Cover into place.

If the brass plunger or the spring are allowed to touch the Hub at all, your horn will blast all the time, like you experienced.