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Many thanks for all of the positive feedback.
Over time I have experimented further with varying the length of the shock cord and think I have now found the optimum length of 110mm. That is about 60% of the length of the original version in the photos. At this length there is no transmission of hand movements/vibrations and it will lift vertically the weight of a binoviewer and two eyepieces without twisting on itself. I did not have a binoviewer when I first made it.
It works so well that it has become a permanent accessory for the telescope. I don't use the telescope without it.
Cheers
Steve.
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