That was my idea. It only has one spring and it's a little tough to get to. But I do have bolt cutters that might just reach in there.
I also called the manufacturer and the lady I spoke to said the display model might have been worn from that many people sitting in it. Well, I think that's possible but improbable. I mean, there was a LOT of difference between the two. The company is sending me another seat plate assembly anyway.
However, another thought I had was to offer the store to swap out the plate on their display model for the one I got. That would make their chair more closely be a representation of their back stock for sale. While also satisfying me and giving me what I needed. I would even offer to do the labor in the store to change them out.