How to change fuel injector pintle cap?

I feel like an idiot asking this because it SHOULD be simple and straight-forward, but it doesn't seem to be that way. How do you get the pintle cap off of the end of the fuel injector? I'm replacing the o-rings and caps on my injectors before I reinstall them and the top ring comes off easily, but I can't get the pintle cap off and I don't feel like buying new injectors after I break one. I've pulled and tried to pry it off, but no luck

Also, I did search and couldn't find how to get the cap off, but I did read you should use vaseline or something of that type to "lube" the injector and NOT use oil. Is that true?

yeah i just went to autozone, so i took an injector w/ me an asked them, they used a screwdriver and got it off. I'm replacing the caps because they come w/ the repair kit and you have to take the cap off anyway to get the bottom o-ring off...

yeah it is a lot of work, it's a big pain in the ass and i've broken like 3 new pintle's putting them back on....i've gotten 4 done, so maybe i'll just try to get the o rings off of the last 4 w/o taking that damn cap off