[pianotech] Is there a tool for the dented nuts on plate nose bolts in old Knabe upright?

[Euphonious Thumpe]

Dear everyone,
     Dismantling a 1919 Knabe Ampico upright, yesterday, got to those annoying brass nuts on the plate-strut nose bolts that have the two opposed notches. Does someone currently sell a tool for this. ( And, no, I'd prefer the answer not be "Vise-Grips(TM) )

Euphonious Thumpe