The non Black Devil (Foxy studio caps) are always long, you’ll need to grind/file them down to shorten them, they only need to extend a little further than your needle. The needle will extend differently on different models of airbrush eg: the needle on my HP may extend further than my Micron so the Micron cap crown tips will be shorter than on my eclipse. The legs also need to be narrow to allow you to easily pick the needle