What is Reddit's opinion of Iwata Eclipse Cs/Bs/SBS Nozzle 0.35Mm?
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The eclipse uses one of these nozzels https://www.amazon.co.uk/Iwata-Eclipse-Sbs-Nozzle-0-35mm/dp/B000BQPNUU I also have the same one and broke the thread when I first got it due to overtightening as well. Unfortunately from what I've found here in Aus the replacements are not particularly cheap. I haven't broken one since the first one though.

I have found though that it's easy to prevent breaking again as I haven't needed to unscrew it at all and just leave it together, I think Iwata even has a cleaning guide somewhere which leaves it together. To clean I just use a small interdental brush designed for your teeth, can be picked up from supermarket or chemist/pharmacy. Just dip in a bit of airbrush cleaner and give it a nice scrub inside to keep clean. Because they're made for teeth they much softer than the airbrush ones and no bits of metal/wire to scratch the inside of the nozzle.