Laurie's memory from Memories of JJ

I think John had a patent or two on things he invented, but the only one I remember I called a "water pick". I don't know what it was really called, but I know what it did.

Using high-pressured water (or some liquid), that thing could cut through METAL like a hot knife through butter. I never saw it in action, but I saw the results on a block of metal. Quite impressive. I hope Lou can tell more about his inventions.