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Re: Confusing Video
going back in is a process aided mainly by gravity. The weight (not mass) of the arm pulls it back down in, so that when you loosen the chains/pulleys, the arm slides itself back down. After having used a similar design in 2004 (having a 15 foot tall arm) I'd say this is a strong option. It's a fairly easy design to make, and easy to maintain (ours never broke, only bent in one place that was weakened for other functionality purposes.
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