harpgirl -

The barrel nuts that clamp the rest on have little holes in them to give you something to "grab" so you can turn them, but you don't need an allen wrench - or anything else that actually "fits" them. They are just holes.

Pros who need to work them a lot usually have some "special pointy thingy" (the technical name for it) that they use, but a heavy weight paper clip can be straightened out to do the job. Just be sure you don't poke the clip through so far that the end of the clip scratches the fiddle. If you want to be fancy, a #00 or #000 (jewelers) Phillips screwdriver (Radio Shack for about $5 for a 6 piece set) will usually fit about right, and you'd have them when you need to fix your eyeglasses.

John