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Originally Posted by RoboTech
+ Heat die is spring-loaded to insure good contact pressure at all times
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There's a spring variant known as a constant force spring. It's a tightly wrapped band of spring steel that has a known load force, which varies very little over its active range because it has a very small spring constant and a very large range (most of which is not active).
I haven't seen a constant force spring that's designed for compression, only tension, but that doesn't mean they don't exist. You might be able to rig some kind of crazy lever system to get compression. I'd go that route before looking at using pneumatics.