8 ball for a trackball???

[independentthread]

I'm still a newbie to the arcade parts world.  I saw a picture of a guy using an 8 ball in his trackball assembly.  Anybody know how big of a trackball I would need in order to do this?  As far as I know, the standard size of a set of pool balls is 2 1/4" and therefore should fit a 2 1/4" trackball, unless there is something that I missed and the assembly is measured differently.
Along the same lines...anybody have one of the size I need for sale!?  If someone has an assembly without a ball I'd be interested in that too.  I would be wanting to use a I-Pac with it because I want to add in a makeshift spinner.....once I can get that in the works anyways (waiting on parts).

Thanks in advace for any help you guys can give.

[crashwg]

Hmmm, you say you will be using an OptiPAC with it eh?  Have you ordered that yet?  If not, you should definitly get a 2

[NoOne=NBA=]

You don't need an I-pac for trackballs and spinners.
The Opti-pac is used for those, or you can get a USB mouse hack from Oscar, and use the wiring diagram he has for hooking a trackball and spinner to the same mouse hack.

[Sasquatch!]

crashwg is correct: you need a 2-1/4" trackball.

[independentthread]

I-Pac, opti-pac...whatever...they both happen to be cards that I don't own...  Yah, so when I said the I-pac, I meant the opti-pac...and as far as buy that instead of the mouse hack, I'm getting to the point where I just want to be DONE with this machine, because it's becoming more of a burden than anything.  I need to buy new joysticks because the first set I bought suck ass, and I knew I needed to deal with thetrackball issue at some point, but everytime I thought I had something figured out that would work, I lost the bidding on e-Bay (a couple times because I just plain forgot to put in a bid before it ended).
But it's nice to know which mouse I actually need if I want to do the 8-ball thing...I was just hoping that one of the moderators might have seen this and had one lying around.  Oh well.
Looks like I have to spend another hundred bucks and then I should be done with this thing for the most part.

Thanks for the input.

[pcates]

Can a mini-pac be used for optics and joys??

[Sylentwulf]

Yeesh, bitter are we?

[independentthread]

Bitter?  Only at myself I guess.  I screwed up on several events of my project and nothing seems to pan out when I do get a good idea.  Overall it's because I have an off cabinet and it would have been better left as Jamma instead of converting to Mame.

[Apollo]

Yes minipac can be used for optics and buttons and sticks.