I read about problems with the M0100 mice and then tried bending the wire at the strain relief while clicking. If I bend way left, it woks sometimes. Contacted eBay seller because it was describes as "Pulled from a working environment". Ordered a keyboard and mouse from another seller. Hope they work. I was able to test ejecting a disk ... and, of course, that doesn't work. I will pull the drive. Hopefully it is just the usual plastic gear that I can get from eBay. I found where the metal piece is supposed to be. It seems to have broken off of a bigger part. I will just leave it off. I bought a Zip Plus to go with this and am waiting on a USB Zip 100 so I can download an image and create a boot Zip disk. If that woks, I will look for either another Zip Plus or a SCSI Zip 100. I like the Zip Plus because it is both SCSI and parallel.