Joined: Jan 2009
Posts: 44,049
Likes: 6,249
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
rustbelt, oil the place where the spring meets the caliper arm at the bottom. That might help.
I'll bet Sheldon Brown explained chain elongation, but I'm too tired to look it up. "Stretch" is really the wrong word for it.
I once owned the catalog with that racy picture. I wish I still had it now!