My main design goal was being able to do a "lathe only" block; I consider this my main innovation, since the miller has been always the rockstar of blockmaking.
It´s optimized for high flow speed over the whole surface by running a thin film of water through a narrowing channel as the radius increase. So it should be somewhat restrictive, but that’s the cost of high surface speed.
The center nozzle is internally shaped to gradually increase speed with the least drag possible.
Here’s the body piece, I casted it, then after lots of turning, some wet sanding and polishing come to this:
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