On Nov 30, 1:55*pm, F Murtz wrote:
Has any one made their own venturi sand blasting head to use on a water
blaster? if so any clues?

No, but I have used the one for my presure washer. It works OK to
shift some sorts of green growing gunk, but it has no power for any
sort of mechanical work, de-rusting etc. It's also a pain to clear up
afterwards.

For cleaning metal, the only thing I've found useful is a pressure-pot
gritblaster. You can make these yourself (steel drum, pipe fittings)