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Spring is compressed under the horn ring.

So, the two bolts holding the plate in place and the spring just sits on the plate? There is nothing holding the spring in place?

Been years since I had a V8 wheel apart and I don't have any decent photos so the memory could be very well kaput. If I mislead, my apologies in advance and hopefully someone else will get it correct and maybe post some detail photos of the ring assy and how it goes together..

I believe that plate is held on by the nut holding the wheel to the shaft. The two threaded holes are only used for the puller. The spring is sandwiched between that plate and another fixed to the horn ring and provides the electrical ground connection from the shaft etc as well as providing the force to keep the horn ring separated from the contact which passes the ground electrical connection to the relay when the ring is pushed.. The horn ring assy itself is held to the wheel by 3 screws that come in from the bottom of the 3 large holes.

Here is a side view illustration and I believe the plate in question is the one where the arrow points.