Might be a long shot but check out www.freecycle.org.

My wife stumbled across this site a few months ago and we've used it
to get rid of a lot of junk....excuse me, to give pre-loved items a
new home. Once you sign up, you can list that you are looking for a
shredder (working or not) and if someone in your area has one, all you
have to do is go pick it up. Might at least be able to come up with
the gears you need.

We've done this with the kids old toys, a fish tank, pet rabbit, books
and movies. Keeps everything out of the landfill, and the one
stipulation is you can't freecycle to resell or sell on freecycle.
Wait, I think that was 2 stipulations.

Good luck, Ed