Hey guys, Need some ideas. My 580 is leaking from where the nib unit and barrel fit together. Its on pretty tight, don't want to over tighten as i'm worried the plastic will start cracking. It's always stored nib up and the barrel is a new replacement. It happened to the old barrel too and ended up filling up the cap with ink. Here's a pic. http://i.imgur.com/ftlEgBn.jpg Cheers.