Originally Posted by
FBinNY
Thank you, as I said, it's been a while. In this case the adjustment must be made with a file, thinning the arm (or a washer) so the bolt and nut can tighten on the bushing without binding the arm.
In any case the OP can discover this for himself. If when he removes the nut the bolt is free to fall out, it's not adjustable. If without the nut the bolt is still threaded to the bridge then it is. Either way he can deal with it accordingly. I only offer the threaded bridge possibility because I have vague memories of dealing with brakes where the back nut fell off but the bolt stayed in place.
Well, it appears you responded to my post when I had posted but then realized I needed to edit further. I was relying on my memory also, but I finally found an exploded diagram at
http://www.flickr.com/photos/stronglight/3720926342/
Part number 15 is the liikely culprit. I'm not sure whether the pivot can be readily adjusted, as I remember there being too much slop in the threads unless the bolt was tight against the bushing. The washer/nylon end bushings can't be filed, of course, and filing the arms may not work if the bushing has mushroomed at the ends, therefore binding on the nylon bushings.