You don't know how much the scroll wheel is needed, until you lose it
Left mouse button out= Screwed!
It doesn't make sense that my right mouse button came back to life though. The ball mouses/meeses, lasted forever. All you had to do was clean the ball once in awhile.
You'd get that bit of lined up lint and clean it off....... Good to go.
Come to think of it, I don't think I ever had a ball mouse die on me.