In looking over a 1990 Schwinn Criss-Cross (getting it ready for my son), I noticed that when I lift the rear wheel and spin it, the cogs seem to move (not rotate) and sway some. Seems to indicate the axle has a warp. Oddly, the wheel, though not quite true, isn't too bad.
Am I diagnosing this correctly?
Is there a fix? or LBS trip? or trash?