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I think this is why a ropeman is needed instead of a small prussik. A prussik lock in both directions so not so smooth while sending it away.
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A Ropeman is smoother, yes, but not needed. A string prusik justr has to be wroked in both directuons.
FWIW this can also be done with a Micro-Mouse and with a standard micro-pulley.
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I used 3 ropes in the masters & confused everyone, including myself, with some strange undescribeable system. Well, the system your describing is exactly that system I used...
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I don't understand why you would need, or how you would use, three ropes. Three climbing lines, or one climbing lione and two shorter ropes?
???????
I'd like to see the original components, if you can find them.
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I found it obsolete with other techniques, and its not very practicable for changeovers. Others have noted other drawbacks.
I remember a version with a daisy chain sling also.
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I've seen many variations to create an extendable bridge. This one seems the smoothest, but I have only played around with it.
I too have found these setups to be a little too cumbersome for general climbing, but they can be a great asset for removing pines or other strongly excurrent trees.