You didn't mention which bearing is loose. If it's the inner bearing, Loctite it on and worry not- - - -the next time the hub needs to come off, the bearing will stay put on the spindle and you'll need to give the hub a good yank- - - -leaving the inner bearing and the seal on the spindle. Then a little heat with a propane torch will dislodge it without damaging the bearing or the spindle. Looseness of the outer bearing on the spindle is a little more of a concern, but not much. I've taken up a pretty good amount of looseness between the spindle and the outer bearing cone with stainless steel shim stock at times. The lace-panty crowd will moan and wail, but common sense needs to rule occasionally when dealing with these old rigs. They're tougher than a two dollar steak, no matter what the snowflakes claim!
Jerry
