BigBlueToe:
That's a pretty normal scenario. A century on a barely formed 17 or Flyer can be a bit of a challenge. Taking rest stops frequently is a good idea. In a year, you probably won't even remember that feeling - unless you have, by that time, bought another Brooks for another bike.

Are you certain the sqeak is from the springs? They rarely sqeak. 17's and Flyers can sqeak when the leather works against the steel frame on each side as you push down on the pedal. I wrote about this on another thread, "How's Your Brooks Treating You?"

Test:
Off the bike, grasp the skirts and sqeeze them together. Does the sqeak happen as you move the leather? If so, place your finger tip between the end of the frame and the last rivet. Just touch it gently. Sqeeze the skirts agian, and feel for the vibration with your finger tip as the noise occurs. If the leather is working against the steel, you'll feel it.

A postage stamp-size piece of innertube wedged between the leather and the frame will eliminate this. Have an assistant spread the skirts away from the frame while you stretch the rubber and get it as close to the rivet as possible.

If it is the spring bolts, you can easily loosen the bolts, spray some teflon on the threads, then re-tighten.