> Is there a way to use an NR derailleur on this dropout
> without removing the derailleur mount?
Before removing the derailleur mount, you might try to see if
a framebuilder can weld a tang in the proper position. In the
past I had a frame on which the tang/rotation-stop became
damaged. A frame builder repaired it by _welding_ extra
material to the damaged area; the dropout was definitely not
replaced. It might be possible to do something similar on your
frame.
Good luck,
Fred - Arlington, Va.
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