@pcamen If any of your wheels haven't liquified, I'll gladly buy your used ones. Especially the two near the paper sensor as shown in the first picture.
Also, when you open a "new" toner cartridge, get a rag or paper towel soaked in IPA. The foam on both sides of the drum cover
will disintegrate and fall off, getting into the drum and melting into the fuser. You'll need to clean off the disintegrating foam. Make sure to have the drum facing downward as you clean it so the foam doesn't just fall into the toner cartridge.
I guess it's there to keep dust and contaminants out of the drum, but not much you can do.