Hmmm, now that you mention it...
I've got the rear drum/bearing still in the unit. I put the inner drum back in and when I spin it, the rear of the inner drum doesn't move up or down, but the front edge has 1/2" of wobble in it! The drum doesn't seem to be out of round so I'm thinking that maybe the shaft is bent. When I get a chance, I'll try to do some measurements.
And yes, the washer is in an unheated basement. The winter temps are in the low-mid 50's. Do you think the oil in the ring got too thick and it got so unbalanced that it bent my shaft? If I need to buy a new spider, should I definitely get a new ring too?
BTW, what's 'bellow wear'?