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Originally Posted by treeseer  vet, it's a rare case when I see the old cable doing more harm than good. Usually I look to add one above, and leave the old one below. I hope you comment on ansi when it rolls around again in 2010.
Today I'm going to cambistat 2 old oaks; no pruning on them this year.
re depth of wound with wirestops vs width of wound with lags, hmmm...   |
The one instance I see old cable instigating, that would be worse than none at all would be where a gaping co dom had been drawn up to closure, neglected for many years (not identified for life span) and failure of cable occurred. This would go beyond the original untreated state into an episode of "throwing" the leader, and the ensuing inertia/momentum could cause the catastrophe that was attempted to be prevented.
Usually a screw rod would be a back up/lateral stabilizer to this installation but this could fail also with such a force.