I just got my first Conway Stewart, which is an aeromatic #57. The pen seems to be in decent shape all around, after I cleaned it up. I do have one issue. This pen always seems to need a kickstart when I start writing. After it gets going, it seems fine, but if I leave it alone for even 10 minutes, the nib goes dry. I have to shake the pen to get it to start. So....what am I looking for?