>>10097321 (PB)
The inline gas pump filters are rumored to work also. Just be aware that their sales (new) are flagged now. They have about the same volume as most oil filters and feature stainless internal mesh baffles. Just as illegal as any other. Use a piece of truck tire inner tube for a wiper. They come highly recommended … just not from me. Concentric pipes with Chore Boy stainless mesh jammed in between are also rumored to be fairly effective and can be run wet with little damage. TBH, I've never tried any of them, but I bought a bunch of books from Palladin Press when it was going out of business. I bought every title that seemed like it might be useful in a SHTF scenario but some of the more interesting titles were already sold out.
Amazing what you can do with a drill press, some hand tools and a torch.
Sigh … the only designs I would be interested in building are totally illegal and I'm not interested in going to jail just to see how they work. ;-/