This is frustrating. I purchased another horn assembly (minus the horn ring) and found that mine was exactly the same. So I believe I am working with the right parts.
After reassembly I was pushing on the horn ring at various points - and the horn ring broke where the spokes connect to the flat plate. @#$%!
I am only getting about 1/16" of movement in the base triangular plate. Most of the motion comes from the flex of the horn ring (which is now broken).
Anyone who has their steering wheel off. I'd really like to know how much motion there should be in the contacting plate.