Hi Wilco,
What I have done is thanks to many other people's suggestions. I take a regular tea bag and cut the top off (the part with the staple). Dump the tea. The bag is folded in half so I unfold it, and cut a strip down the length of the bag. My strip is about 1/2" wide. I have a 901 so this width would fill the depth of my cart.
I use a plastic coffee/cocktail stirrer (someone here has used the ink cartridge of a pen). Holding the end of the tea bag strip I start to roll it around the stirrer. I roll it around once or twice, then lay both the stirrer and tea bag on a surface so that I can keep tension on the tea bag while I finish rolling the tea bag (like rolling up a carpet). I try to keep it rolled tightly (that makes it easier to insert into the cart). Once it's rolled fully I slide the tea bag down toward the end of the stirrer. Insert the stirrer into my cart and continue to slide the tea bag into the cart while sliding the stirrer out. With sharp scissors I snip off any tea bag that is taller than the cart. I then take something small like an unbent end of a paper clip to make sure that there is an opening in or near the center of the tea bag because sometimes the scissors will flatten the tea bag where it was cut.
I really hope that made sense! Good luck!
Jim, I'd be very curious to know who the steel wool works for ya!