You use an emery board or a piece of very fine sandpaper. Just give the idler wheel a slight scuffing on the outside making sure that you evenly scuff the rubber all around. Maybe 3 or 4 light scrapes per section should do it.
If your rubber seems shiny, just give is a light scrape until it dulls.
As for the tonearm, I don't know about Arvin, but in Dual turntables there is a tiny plastic guide in the tonearm base that becomes worn and replacing it restores the proper tone arm function. Maybe there could be a auto shut off switch that is out of adjustment?