John I bought a few of these oscillating type guns a while ago for tests on leather, silk and rug fringe treatments. With regards to foaming machines I again have been through different processes over the past few years trying different chemicals.
I have the same former you posted its in brand new condition, also I have a foaming maching availible for sale that fits straight onto a buffing machine to produce large amounts of foam for bonnetting or you could make it into a foaming machine for upholstery if you where that way inclined.