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Re: Out stretching surgical tubing.
When 27 ran our surgical tubing catapult in '08 we made "cartridges" using carabiners (rated for climbing and with a proper safety factor) that would provide 50 pounds of force when stretched the desired amount, and would test them after events to determine if they needed replacing or not.
I don't recall for sure, but I believe after every event we just replaced the tubing.
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Team RUSH Alumnus and Mentor, Mechanical Engineer
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