These products are available. I bought one about 4 years ago mail order from
somewhere. It is about 1/8" thick aluminum and works well, though you do have
to keep the wood moving to avoid burning it. It works well at sanding edges
because the table and blade are at a near perfect 90 deg.
You can see one at
If the link doesn't work, just type "sanding disk" in the search box.
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