Joined: Oct 2003
Posts: 839
Likes: 1
From: philly
Bikes: trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
If you're OK with the gearing, you could try some cheaper, shade-tree procedures:
1) put a old freewheel spacer behind the fixed "cup."
2) If it's older steel tubing (eg 531, sl), you can bash the chainstay in with a mallet. Crude but effective.