Several years ago (abt. 1998 or so I believe -- whatever year it was that CNCH was in Grass Valley, where I was living at the time) I was looking at adding a couple more shafts to my Glimakra Standard horizontal CM. It turned out that my existing heddles were actually 275/12 mm, a size no longer available. So Lars at Unicorn suggested that I should convert to 330/12 mm heddles, "since it would give me a larger shed".
You can see on his website that he's still recommending this:
http://www.unicornbooks.com/weaving-texsolvheddles-SQL3.asp
(scroll down to the comments next to the 280/12 mm and 330/12 mm heddles).
Well, I went ahead and purchased 20 bundles of those 330/12 heddles, but never put them on my loom (my existing heddles were nicely color-coded, and I still haven't added the 2 extra shafts).
Anyway, now I'm looking at adding more shafts again (via a vertical CM) and I'm wondering about this business about a longer heddle giving a larger shed. I've been looking at my loom and just can't figure out the mechanism whereby the eye of the heddle would move a greater distance if the heddle itself was longer.
Can anyone explain how this might work?
-- Constance