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Check with these guys: http://www.americanfabricfilter.com/

I got some heavy plastic bags from them for my Jet DC along with a larger fabric top bag.

You might check with a automotive machine shop. I've been out of that business for 20+ years but some used to use a large purpose-built belt sander to refinish cylinder heads. Not as accurate as...

Wood magazine had an article regarding replacement filters a year or 2 back. One of the reported better performers was a replacement upper-filter from American Filter Fabrics. The filter/bag is...