The problem with maintenance free stuff is that it's not meant to be maintained and therefore not really meant to be taken apart. This one came apart pretty easy. What I found was a ton of fiber and fiber dust and grit embedded in the lubricating grease on the gears and it had dried rock-solid. I was kind of surprised at the amount of dirt as I always use clean fibers and keep the card in a box when not in use. Then again, it is 12 years old. All the parts are plastic and wood except for the metal crank and pin. I was afraid to use any solvents to break up the grease, so I tried using a tooth brush and tooth picks. I finally resorted to soaking the 2 small gears in some Dawn dish soap. That loosened up the gunk enough to remove it. Then I re-lubed the thing and put it back together.
So, a word to the wise...If it says it needs cleaning, then it is built to be taken apart and cleaned. If not...it still needs to be done and it's a pain in the butt.