I pulled apart a dead 901 atty today, first I removed the bottom
threaded bit, then I used a pencil (eraser side) to just ram the whole thing out. I still can't figure out how the atty died, I was still getting 0 ohms resistance across the 2 lead in wires and it wasn't too terribly dirty.
What I'll try next time: Insert pencil eraser first into atomizer so it touches the wire bridge, ram against something hard while holding onto shell. The bridge should be strong enough to pop the whole thing loose and still hold together.
As for re-assembly: good luck!
Ninja edit: Actually, I do think I know how it died, I rigged up a re-circulating pump to run lemon
juice through an atomizer that was a perfect seal, you should have seen the
juice shoot out the side hole, it would've gone 15feet easy! I then blew it dry with a can of air using the same fitting and some tubing. I think that the pressure may have pushed the center lead (read: positive battery connection) in so that it bypassed the little rubber insulator and closed the circuit before it ever hit the atomizer. I did notice some fibers on the inside edge of the casing afterwards, but it didn't occur to me at the time that they were the wicking material.
So, protip: Don't use a fuel-filter from a model airplane fuel pump for a fitting, even if it screws into the atomizer *perfectly*, no good can come of running that kind of pressure.