Rapier, I did find that article on Google (
http://yarchive.net/gun/barrel/foul_out.html ) and read it. He does not say how to construct the device, and in the end he recommends against using the homemade chemical to remove lead.
I will heartily agree with you about RB-17. I've used it and loved it, but hadn't seen an RB-17 dealer at a gun show in ten years or more. I thought the product had gone away.