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90* side anchor but it has to be at the same level than the hinge. Too low and it gives some slack (or more like not pulling enough to the lay), too hight and it pulls harder, overstering the tree.

Thinking of it, you should cut the vertical kerfs not vertical but parallel to the trunk's axis. That would reduce the amount of crossing the fiber's path and then the likeliness of a hinge failure. Maybe not enough in this case to avoid the loss, but a little bit could help.