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I dont know anything about bikes, I just got an old 1986 peugeot iseran for a commuter. When I got it I was messing around figuring how any of this stuff works and I think I ended up messing up my rear derailleur. its all limp now and doesnt hold any tension when the chains on it. Any way to realistically fix this, and if not Id rather never have to deal with derailleurs ever again in my life and convert to a single speed. Any good guides or conversion kits you guys would recommend if so