Hello, Just recently got a few NOS Omas pens, and decided to ink one of them, picked an Amerigo Vespucci and inked it with Parker Quink blue-black, when started to write realised in is driping from under the nib on both sides, I want to take out the nib and re insert it, my question is if the feed and nib are friction fit or screw in? Thank you in advance.