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Why not use animal fat? Does, say, pig fat compress differently than human fat? I would think that would be something that you could obtain easily at any butcher shop, especially if you explain to the butcher why you want it. You'd most likely have to pay something, but it seems like an easier fix to me than springs, especially since you'd have to calculate how much fat compresses and find springs that compress accordingly.
The simplest answer, it seems to me, is to contact your local medical school and see if they have an obese cadaver they'd be willing to loan you. My understanding is that medical schools are generally pretty good about research, but your results may vary.
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