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Don't know why a thicker bodied nozzle wouldn't work.
I use a #4-40 tap and a common screw to make my own adjustable valves. Just grind the head flat when it's ready.
I used "washers" made from AEG cylinder head black rubber bumper material...two thicknesses were just right. I used a little pipe I had laying around and sharpened the rim of one end...then used it as a cutter to punch out disks. Mines not pretty, but it's got 100's of rounds through it.
The material has to be stiff enough to press the nozzle tight in the chamber.
Best of luck,
Tys
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