Have you tried adjusting the nut on the mounting bolt just in front of the fork? It should have flats to fit a cone wrench. Your sheldon link refers to cantilever brakes, but you said yours is sidepull - that would explain why you didn't understand it...
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"