I think that lifting on the corners offers the most stability because it maximizes the distance between the pull points. Unfortunately, getting the cables to the corners would add even more complexity to the design than I've already got (more pulleys!).
Princess Auto was a great suggestion. I've now got the pulleys that I need.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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