Test your wits - Suntour Symmetric reassembly challenge! With pics!
Should tell you more than you ever wanted to know. They do indeed work pretty well with a double crank or the first and second rings of a triple.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)