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Can A Sega Trackball be hacked?

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EwJ:
Resurrecting this old thread to provide info on pinouts in case of future searches on Sega Trackballs.

I have 2 Sega trackballs with the same optics as AwesomeAlbert's.
These are not the same as Crowquill's - so I  don't know if the
pinouts for those are the same.

Working well with a mousehack (microsoft ps/2 mouse).

Pinouts are:
1= +5
2= X1
3 = G
4 = X2

AwesomeAlbert:
wow, it this thread came back from the dead !!! I going to go dig around to see if i can find that sega trackball.

thanks ewj

EwJ:
Further info: (and request for info/parts)

While the Sega  2 1/4" trackball assembly looks identical to the Happ 2 1/4,
there are definitely some differences. 

Most notable are the optics, but the rollers and bearings are different as well (see pics below).

I don't have Happ roller bearings to compare to, but the I.D of the bearings for the
Happ must be larger.  (must be approx .250") (Sega bearing I.D.= approx .235").

If the Happ bearing O.D is larger, then the part of the trackball housing
where the bearings sit will be different between the two brands as well.

The Sega rollers are larger in diameter (than the Happ) where the ball sits and
smaller where they fit into the bearings.

Does anyone have a measurement for the O.D for Happ bearings for 2 1/4" Trackball?
Does anyone know where to find replacement rollers and bearings for Sega TB's?

I need at least 1 set of Sega Rollers (rollers are very worn on both Sega TB's I have here).
If anyone has the same TB's with some good parts and has extra rollers, but needs
other parts? 
Will buy Sega rollers.
Will trade 1 Sega TB with working optics (really worn rollers and maybe
missing couple of bearings) for 1 set of rollers. Crowquill? Albert? Anyone?
I also have 1 set of Happ 2 1/4" rollers for trade.

Edit; add - measurements below done quickly - good enough for these purposes but give or take a few thou.

EwJ:
Confirmed - Happ bearings have larger O.D. (approx 0.625") (I.D. 0.248").
Same bearings are used for Happ 2 1/4" and 3" units.
The O.D. is too large to properly fit in the Sega housing.

Still looking for rollers and a couple of bearings (Sega) -
there appears to be no sources for these.
I'll give B/S/T a shot.

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