Measurement for Series 850

A quick learner from Delaware says:
When measuring for the correct part for the S850 block and tackle balance, what part of the window am I measuring? Top to bottom? Or the half way point to the bottom/top?

Thank you
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Paul from SWISCO responded:
You don't measure the window at all. Instead, you need to measure the balance itself. Check out the image below to see exactly what you have to measure to determine length.

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