Actually, thinking about it some more I believe that a simple set of concentric circles(with the cross jet) would perform slightly better (you could use a finer lathe tool and make thinner rings/channels)
May as well try for 1mm rings/channels, also makes it far simpler to machine, since you only set it up on the lathe once.
I'll have a think about how to set up the jet's structurally.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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