Hi Roger,
What kind of deadening material are you using? Loose fiberglass, rayon, FiberFill, that recycled blue jean material, or open cell foam?
I just finished up a project that required very little filling, so I went with rigid fiberglass ceiling tiles. I stripped off the layer of pebble-grained plastic, then cut the tiles to size and used contact cement to attach them to the cabinet interiors. I also used some "fender washers" and drywall screws to give additional support.
In another project, I used rayon pillow stuffing material and attached it with spray-on contact cement. Wasn't sure if this would work, but it has so far. Of course, this fluffy type filler tends to be held in place by the mass of material under it, connecting wires, etc., but your idea of using cardboard washers should work quite well, too, because you can cut them to a size large enough to actually do some good.
In the past I've envisioned using fiberglass screen (the type used for your window and door screens) to make pillow case-type bags which could be filled with whatever loose material desired, then attaching them to the interior surfaces with a combo of fender washers and contact cement. This is probably going a bit overboard, but I have thought about trying it.
It'll be interesting to see what other alternatives have been used. Imagination is the limit, of course.
GeeDeeEmm
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