Here's my problem when adjusting the cones on my hubs. Let's say I make an adjustment, tighten the lock nut, put the wheel on the bike, check it, and find that I want it a little looser.

Ideally, I'd loosen the lock nut, and then loosen the cone by, say, and eighth of a turn, and test again..

But in loosening the lock nut, the cone also turns, so then I don't know where it was, and I'm starting from scratch. What do you guys do to avoid this? I could put the nuts on the other side of the axle in a vise, but that would mean removing the skewer for each adjustment.