This is a Kenmore Model 87182100, which is 10+ years old. It's a gas unit.
There is a slight wobble in the drum. Not terribly noisy, but annoying. I opened it up and could not find anything obvious. When I turn the drum by hand, I do not feel any spots that would cause this. Felt both idler rolls and the seem smooth.
There's some amount of play front-to-rear, but am not sure how much is normal.
Anyone care to guess, what may be the cause, or what's worn out?