Hey Scott,
Well here is my $ 0.02.
What a pain. I sure alot of folks will recommend a new machine, but it looks to be a nice machine so,
I have a couple of thoughts.
1. Try and repair it yourself. Grind or cut out a patch and glue it in. Or maybe you can find a hard rubber in a tube that you could inject and form up against a mould (Plaster?). I know you can get specialty casting compounds in different hardness ratings, the jewelers use them, but I exppect them to be expensive.
2. Check Craigslist for a parts machine. I saw one for sale (a 22-540) for sale up in Asheville on CL. There is a good chance that the mechanicals are the same. Then you would have other spare parts like the cutterhead and gear train
3. Post a request for parts and information on woodnet or something similar. Maybe OWWM.org ( a stretch, but they do have members that use them when the blinds are shut)
4. There are businesses that would rollers. Not sure if there are any in the WS area. I know the knifemakers use them to recover damaged and worn wheels on their grinders.
Hope this helps.
M