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Re: How legal are tension springs?
If there is no rule against them, then they are legal. (There is none).
Keep in mind, however, that surgical tubing can provide as much force as you need it to - just keep adding bands of surgical tubing. That is why it is so wonderful to work with. If you want to used springs over tubing, then I'd prototype with tubing to find a rough spring force constant and verify it with a little math. Otherwise you'll be spending a lot of money on springs.
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