It sounds like something has either jammed inside next to the wheel, or the wheel had popped out of its centre mount on one side, that could explain the being off centre also.
You might be able to fix it.
You need to remove the four pads underneath to expose 4 screws,
remove the screws, then you can lift the top off the mouse, you’ll now be able to see what the problem is with the wheel.
If it has just popped out of one side you can probably pop it back in by pulling the mount on that side away from it and pushing the wheel back to let the centre piece click back in.
If there is dirt in the wheel then that may be harder to fix, as the wheel has several spokes which flicker past the sensor.. if the spokes are clogged or blocked (light isn’t able to pass through the gaps between) then there would be no response.. (same if mis aligned). You could try using a cotton bud with some alcohol to remove the dirt. Mine had some dust and fluff etc in the bottom of it..
To fix this I partially unmounted the wheel by pulling the centre mount away from the wheel and lifting the wheel.
There is a piece of metal that keeps the wheel in place, I didn’t touch that. Lifting it partially I was able to get in underneath where the dirt was and clean it with some isopropyl alcohol on a cotton bud.
I then had a fully working mouse again.
Good Luck!
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Replace the scroll wheel. The legs connecting to the rotation sensor may be broken.
da fbmt11
My wheel stopped free-spinning a while after I got it. Lately is has not been registering my spins reliably, often going in the opposite direction I am spinning it for a second before correcting itself.
I was just coming to iFixit to see if I could find a disassembly guide so I could get in there and clear what I assume is debris causing the issue.
As a stopgap measure, I've instead blown it out with canned air and swept on either side of the wheel with a keyboard brush. This has resulted in better scrolling performance, but did not resolve the issue where it no longer spins freely when clicked.
da Jacob Pierce