Joined: May 2023
Posts: 364
Likes: 2,250
From: Big Sur California
Bikes: 1946 Holdsworth Cyclone, 1969 Cinelli SC, 1972 Raleigh Pro, 1973 Merz road bike, 1974 Alex Singer Sportif, 1974 Merz track bike, 1975 Teledyne Titan, 1976 Ritchey road bike, 1977 DiNucci built Merz track bike, 1977 (?) Exxon Graftek, many more!
It is unlikely that you will get a file to cut grooves inside the cone, it's RC62 or something hard. Just back it off over the damaged threads. Put some oil on first.
Jim Merz