This is my Microsoft Trackball, which I L-O-V-E and can't imagine living without. If you click on the picture, a larger one (hopefully) will open, and you'll be able to see the arrows pointing to the miniscule beads which allow the ball to "connect" as it directs the cursor/pointer where you want it. The arrow with a yellow star points to the one bead that has a proclivity to fall out and roll to Lostville unless/until I'm able to locate it. The first time it came out, I was aware of what had happened and was fortunate enough to find it . . . on the Berber carpet! This afternoon, I may have had a little fit because the Trackball was being sluggish. I may have slapped and pushed it to the point of sending that one little bead to Lostville. This time, however, I had no idea the little bead had taken a hiatus. Imagine my horror when I returned to my desk later to discover my little bead buddy was missing! Yikes!!!!! [Freeze! Nothing and no one move!] I'm so sorry for being mean to you, little bead!!! I carefully scanned my desk, which was fairly clean--cleaner than the picture I posted a day or so ago--and no bead. I slid my chair away from the desk and got on hands and knees to search the Berber carpet which, to a tiny bead, could be a gigantic new world. Believe it or not, it didn't take long for me to find it--WOOHOO!!!!!! This time, I decided to put a little drop of Tombow Multi Purpose Adhesive to help hold the bead in place and, so far, all is well. The more I think about this little scare, the more I think my little bead buddy was really just wanting attention--reaching out, so to speak. I just hope I find another Trackball to replace this one when it stops working because I really and truly will have a hard time learning to use something else. The moral of the story is . . . A bead in the Trackball can easily cause many beads (of sweat) on the forehead.