> Split the cost with another service company and they won't even let local companies borrow it. It's that valuable. Could make one out of an old inner tube I imagine. Say for a 12 inch wheel and somehow cut it in half (making a u shape) and seal the ends.(so you could slip it under the agitator) Using an air compressor to inflate is basically the same thing. I bet a local tire company could make one. And being thinner may even work better. Will see if I can get pictures.
Air is compressible and won't do it, but water would.
You should be able to take an inner tube a little smaller diameter than the agitator (maybe from a trailer tire?) and hook up a water line, stretch it over the agitator bottom, slip it under and inflate it with water.
I can't imagine why that wouldn't work and should only be a few bucks for a tube,