Springs can be replicated. I know spaenur will sell you the springs in various sizes, along with the hog rings etc. In the end I guess it comes down to how accurate you want to be and how much you want to spend, and how much time you want to invest.
As to aircraft seats, you can keep them. My tailbone still hurts from the 14 hour flights from Toronto to Dubai on United Emirates. Once was the time I looked forward to flights.....not anymore. The seats feel like bricks to me.
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