Hey! I didn't say I understood it...just that it happens!! ;)
Yes, one way does turn the rod. I don't know if that's the deciding factor or not....just that it's been a complaint on this board before, the method was suggested (if I knew by whom, I would gladly reference the post) and it works. Well, worked for me and reportedly worked for others.
I'm sure the answer is relatively simple (you are likely correct about the rod), but I don't know what it is.
That's what I do best! 'Tis why I'm affectionately and lovingly known as 'canynclutter'.
Cheers! :)