Not that any of this is new but a nice PDF with some good pictures that I found:
http://www.agriculture.purdue.edu/fnr/urbanforestry/pdf/06CablingBracing.pdf
Has some nice shots of older systems taken out.
http://www.westerntree.biz/assets/images/default/products/1258.jpg
Assuming you are drilling through the tree for the rigguy just put an appropriate sized rod with one of those and pre-wrap/pre-form the cable to the eye with a thimble. That should eliminate any concerns over angle.
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