I agree, the trackball worked ~pretty well~ (I've used it for a few games of marble madness). Funny thing is I never played this at the arcade, only on the NES, so at first I was like "Oh wait this is a trackball game"

Anyways I did take the ball out of the mouse and checked how well it spun a few nights ago. It did pretty well from what I remember, but I have to retest it with Marble Madness.
Anyone know where I can get a nice
SMALL (preferably around 1", but 2" would be ok) trackball. I don't know poop about hacking up an arcade trackball and mounting it (and hooking it up to the I-pac 2). And forget the happs trackballs. They can bite my butt for $200 (for their 1 1/4" trackball)