Thanks! I forgot about the spring holes in the cage, and got excited when you mentioned it! But I took a look on my way out the door this morning, and the spring is already in the lower hole, so that means drilling a new hole is likely my only option right now.

What about the opposite approach - are there multiple mounting holes for the upper pivot spring? I'm not averse to disassembling it myself to find out (and I do have a really nice SunTour Cyclone GT as a safety net), but does anybody know offhand?