'72 C-10 Steering Wheel Problem

[C10 - C90 Bill]

Changing my old rough green Steering Wheel to a good used original black one. I'm having trouble with the Horn Assembly. On my old wheel, the plastic ridges on the inside are pretty much even with the metal base and when completely assembled, I'm getting a good "rock" with the horn cap cup to properly operate the horn. On the black wheel, the inside ridges which the metal plate sits on are higher and when assembled I'm getting just about no rock and the horn will not operate correctly.

Stranger yet, I have a 2nd black wheel in good condition and those inside plastic ridges are even higher. Making it also not able to work properly.

Wondering if is a known problem with these old wheels? Unless there are 2 different designs, it's almost like the plastic got effected by the heat all through the years.

Any help would be appreciated.