I have an Iwata Neo TRN1 that the paint was coming back into the trigger area. I tried to tighten it and broke the screw. I bought a new one with a new O ring. I broke it again trying to adjust it. I've tried some different screw drivers with no success.
I've seen the Iwata screw drivers specifically for them but only in a set (expensive). Does anyone have any ideas of other things to use?