I have a non-quick-release rear axle, the kind where you screw the bearing cones along the axle into the hub from either side, with a locking nut outside of those, and you have to get them just about right so that with the additional tension from bolting the axle back into the dropouts, the bearings are held under a suitable tension and the wheel spins freely but doesn't wobble.
My problem is that after, I don't know, a few 10's of miles at the most, the wheel always becomes really loose again. I can hold the wheel and wobble it significantly, relative to the axle. That is to say that the interior of the hub, the bearings, and the cones on the axle, are no longer being all held tightly together.
I hope that all makes sense...
It causes no problems when riding, but I worry it will be damaging the bearings or something.
How can I stop it always coming loose like this?