[TowerTalk] which rope for element anti-vibration

[Paul N1BUG]

I'm trying to get a better sense of how the rope in elements to stop 
vibration thing works. I've read that it works because as the element 
swings in one direction, the rope slams against the opposite side, 
providing a counter-force. What confuses me is that I don't understand 
how the rope is free to move around. Nylon or polypropylene seem to be 
recommended but those ropes come coiled or folded and they have a memory 
effect, so they don't lay flat. When  put inside an element, they are 
going to be pressing against it in multiple places and directions. It 
seems like that would limit the rope's ability to move to do its job. 
What am I missing? I have seen braided rope with extremely fine strands 
that is soft and doesn't have the memory effect. Is that what I should 
be using?

My 6 meter yagi was having a problem. The element tips were oscillating 
at about a ~200 Hz rate, and the tips were moving at least two inches! 
It took four trips up the tower to rig and get it down. It will take 
another four climbs to put it back up, and more if it still has a 
problem and needs to come down again. I'd like to try to get this right 
on the first try to avoid all that extra climbing. The four foot center 
section of each element is .750" OD, with .625" tips. Any practical tips 
or experiences with similar elements would be appreciated.

Paul N1BUG