MikeCD, In one school math class, the textbook included the answers to odd-numbered exercises so the students could check their work. Problem was, some of the given answers were wrong. That taught me, "Just because it's in print, that doesn't mean it's true." That the person writing the description could make an error between 8 and 12-strand would not surprise me given the "quality control" of today's world.
That rant aside, as others posted - 7/64 is completely adequate. A more significant issue might be handling. The thicker the line, the easier it is for me to deal with. It is amazing what that small difference between 7/64 and 1/8th can make. A Button Knot in 1/8th looks gigantic next to a button knot in 7/64th.
Before you go full bore with the whoopie style, you might want to consider the UCR.
Here's a link:
https://tinyurl.com/63yt4f4r
The UCR uses less material and can be made so it has a "lock" that tightens if it starts the slip. TensaOutdoors uses UCR's for the anchor line of their support structures.
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