I have another question. I noticed the mafac racer centerpulls - the springs are rusty. Is tehre a way to replace them? It seems like a simple enough part (part 458 shown in the first diagram here http://www.sheldonbrown.com/harris/mafac.html)

I have a junk bike (rusty motobecane mirage from the same time) and the Weinnman 999 centerpulls are in nicer shape so I suppose I could try that - but I'd rather restore the original parts if possible.