[quote=havliii]Is the Harken Company a respected authority? Harken blocks which we all know and love. See this link and scroll to the instructions for rigging a 6-1, blocks turned 1/4 to one another is the recommended method, no oval race track here. You can also reference US Army field manual FM 5-125. I would defer to either of these authorities. A 7-1 adds one additional sheave and ties at the becket (top block) or the boom.
[url]http://www.harken.com/pdf/4451.pdf[/url] scroll down after PDF loads.[/quote]
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