^ "Also tears up the bolt head"
While that can happen, in my case it did not. I used a 10mm open ended off set wrench, I was careful, and the bolt head remained unmarred. It took longer than 2 minutes though, more like 5.
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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"