I was able to remove the wheel with a butter knife, I forced out the pin on the side opposite the ratchet jammed my finger in a way to stop it slipping, then pried the knife in the other side and levered the other side away. It made a bit of a scary noise but nothing broke. I got it bck in my sitting the wheel holder on a flat surface, pushed down, and pried the plastic apart on the ratchet side with the knife, and it popped in all at once. As a warning though, the friction of the scroll wheel appears to have increased, it no longer scrolls for forever, but just a few seconds when given a hard flick. I was only game enough to try getting the wheel out cos I recently got the MX Master 3 cos the tracking stopped working on my MX Master (It worked again as soon as I opened it though)