I've never played the 60-1 Centipede or Millipede, yet, but have played many of the other games. All of the other games on the 60-1 that I've played were fantastic.
Which trackball games are you talking about that "all track at the wrong speed anyway"? 60-1?
I don't think I'm messing anything up, just tired of the 12 Atari games and like the games on the 60-1 much better. I'm not making any permanent modifications to the Arcade 1UP (not that it matters!) and can put it back the way it came very easily. Just trying to make a trackball work for Centipede and Millipede.
I ordered the one JDFan linked. it should fit in the same hole as I currently have, although I will have to router out the pocket a bit more to accommodate the 4" case.