Wow...your's is missin' all the guts.....there are about 4 gears in that thing and a bottom plate...
At any rate..you should be able to use an oscar mouse or hack your own mouse to get that board to work...
you'll have to trace the leads to see what order the connections are in..it should be something like below.
NOTE: this isn't an any specific order, that's why you'll have to trace the board to determine what order it is yourself....I'll see if I can figure it out, but we may have to recruit JJ on this one.

X1, +5, X2, GND