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I'd venture to guess that as much as that reason, the blocks are to maintain the cable position on the limb in the event it goes slack, and if that's right, they seem to have worked pretty well.
It's obviously been a number of years since the cables were installed. It's a shame they weren't maintained. If they had, the system would likely have been relatively non-invasive.
Glen
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I guess yuor right. This system could have worked quite well. However the cables are far too low in the tree and also the branch unions aren't particularly weak or suspicious so the whole exersise seems to have been a waste of time/money.
I'd almost suggest removing them altogether although this would be risky as it's hard to tell if the tree has become to depend on them.
I've not done any cabling since I started my own company, previously with other companies I had only used the bolt through method. I think I need to get upto speed with the cobra system before attempting any remedial action.