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Teflon tape as in the stuff plumbers use to wrap threads on pipes right (I believe that's what was used in the hopup rubber mod that Syn posted here and in some other thread)? at least that's what I've used (for regular screw threads that I don't want loctite on).
I've had to "cheat" on a build and use a LOOSE air nozzle on one build...a M100 spring was too low (350ish) and the M110 spring I had on hand was over 400 sometimes (405ish)...didn't want any risk of running the build hot (I consider that cheating) for the fields around here...so I used a loose (it wasn't that bad, just a little air leakage and not a full instant compression like the original one) air nozzle and it dropped the FPS right into the 385 range with a M110. Decided not to tempt fate and left it at that.
The little o-rings inside nozzles are sometimes really gummed up or dried out. I've found that it works well to use a flat bladed micro screwdriver (better it it's worn a bit and the edges aren't sharp) to pry it out. Then clean and relube it, and reinstall it. They're very small and fine...so pretty easy to nick without something blunt to pick them out.
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