So the vintage Planet tuners on my National Triolian tenor are becoming unreliable, and I resolve to replace them with new Rickards.
Come time to remove the old tuners, however, and this is what I see: they are held in place by weird little round nuts with two notches in them. sort of like a castle nut, but castle nuts tend to have more notches.
Diameter of this nut is about 0.42".
Any ideas for getting it off without scratching up the headstock? I gather there is something called a "hook wrench" or "locking nut wrench" for nuts like this, but the smallest one of those I can find is 1/2 inch and I'm not sure it would work.
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