the pro mouse that came with my iMac 400 has had a hard life.
About a month ago it fell off the desk for the last time. The cord got yanked a little and the connection to the computer became very very intermittent. I could see where the wires had broken right at the base of the cord going into the mouse. In the end the mouse became unusable so i took to it with a knife.
Take note. the pro mouse is completely glued shut. There is no way of opening it with out doing some damage. I managed to lever the black/grey ring off that goes right around the bottom (after picking out the white pad) - this was not easy and i broke it in a few places. Once you have that off you can just pop the mouse apart.
However when i put it back together the whole thing squeeked (quite fitting for a mouse really) and was quite annoying. Also because i had bent the grey ring the mouse wouldnt sit on the desk flat. In the end i went and bought a new mouse - one with 2 buttons and a wheel. Its not nearly as classy as the pro mouse but cost a fifth of what a new pro mouse costs.
But if you have nothing to loose go ahead, rip in, it quite interesting to see how little circuitry there is actually in there (no more than a matchbox).
Its also quite entertaining to plug two mice in at the same time. If any one else ever uses your computer leave both the mice plugged in.
phew, what a ramble...