I had really good luck awhile back with just rolling the inner cotton diaper piece from a horizontal carto into a tube shape and wrapping a coil around that. But that was before this thread so I didn't believe it would work long term. Now I've been rebuilding my echomizers for a couple months now so the material is in short supply. Haven't found an appropriate replacement yet. I've looked at all sorts of things from cotton makeup pads to old t-shirts but haven't found anything with quite the right thickness and density.
The inner filler of a standard sized horizontal carto is too small for a ce2 but might work in a ce3 or a stardust
The inner filler of a standard sized horizontal carto is too small for a ce2 but might work in a ce3 or a stardust