I do have 3 needles (0,12, 0,20 & 0,40) and had a hard time with mine. I figured out something that isn't mentioned in the manuel of H&S Infinity. I knew the needles have tabs on the back according the size. 1, 2 or 4 tabs. But the nozzles have marks too. 1, 2 or 4 rings.
4
2
20
482
1
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So, combining a 0,20 needle with a 0,15 nozzle (not 0,12) wasn't a good idea. Not by purpose.