Slightly twisted might be a better way to describe it. Seems to have a barely discernable vertical S-curve from the lower part of the dropout to the tip of the hanger when viewed from the rear. The mounting hole is visibly ovalized and the derailleur won't start threading in.
I'd like to avoid using a dropout saver to fix it if possible. Is this something best left to a local framebuilder for repair? Anyone here done it? Based on my description, how much should I expect to pay someone to get the dropout & hanger back to normal?
This is on a mid-1980s Trek with a Reynolds 531 frame.