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Would the vinyl blinds used in homes have a rope system equivalent
to what you want to do?
That system would do the trick, but it is inelegant because two ropes
would come down. I do have a scheme which would give me one rope and
a mechanical advantage approaching four. It relies on an instability*
that I know exists, but I won't know if it actually works until I try
it out at full scale. I was just hoping that someone here had solved
the problem already.