I wasn't skilled enough to bend once, I spread the frame (left side mostly) in 3 or 4 small increments - I was afraid of overbending so I worked up to my final result without going over.
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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"