Steel wool is what is supposed to be there. It is a filter of sorts, but it doesn't do the same job as the engine air cleaner. When vacuum or spring pressure is applied to one side of the diaphragm, air has to go in and out of the other side, or the diaphragm couldn't move. The air goes in and out through that steel wool screen. Clean it with solvent, soak it in engine oil, let the excess drip off, and put it back in.
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