David Johnston posted:
Nut drivers, like sockets, have a little taper at the end of the hex to aid in getting it on the bolt head. This can prevent them from engaging the thin hex heads used on some model trains. I had the end of all my nut drivers ground off so the full hex goes right to the end of the opening. This really helped with many side rod screws. A local auto machine shop did the grinding on their valve grinder.
That’s a good idea, did you watch them do it? ......I’m guessing they swiped at the face with the stem trimmer?..........Pat