What I don't get is why if they could do that in 1996, why can't and don't they do it today? The players alleged the FoxTrax puck felt different (despite it passing rigorous tests, apparently), but surely with today's technology that wouldn't be an issue, heck they might not even need to change the puck at all.
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Here's some interesting info on FoxTrax FWIW: https://en.wikipedia.org/wiki/Foxtrax