You got it!
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Line tension X legs of pull per point
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For purist view,
Pulley on anchor does carry 2 X 1000 Line Tension
BUT, is 90 degree spread, so 2 X 45 degree deflection from center.
>>>>So anyway, more like 2 X 707 than 2 X 1000, pulling at angle too.
Playing that backwards, if were...