Regarding variable angles this tool can probably make your bent needles to "
work" again but never restore them to what they were prior.
The needle of an
airbrush is polished to a very fine surface texture and tolerance and this, let's say a bit crude, tool will never do this...
It's probably ok for a paint gun with thick needles and large nozzles but good luck fixing that 0.15mm
airbrush needle... it just won't happen!
Be careful with your needles and use a tip (cap) that gives you a bit protection.
The tip protector on H&S airbrushes (the one with two posts, one on each side of the needle) is more than enough protection and if you have to get closer than that you're doing something wrong imho. We're talking about ~4 mm gap here to the surface. When would you need to get closer than that?
This is what I'm referring to.
The only tool that could possibly work is something that would work as a pencil sharpener, with fixed angle, multiple rotating stones and motor driven for accuracy, with various stages for grinding and polishing.
This is something where you spin the needle between your fingers and not exactly what I call accurate?!
I might be wrong and you might get it to work but I wouldn't spend $100 on this. I'd rather buy a different cap or whatever you call it and never take it off.