I have a Mont Blanc Meisterstuck - I know it is not a great pen, but it is exactly what I need, and a gift, so that is what I am keeping. anyway, I let it go dry, and didn't fill it for a year or so. I just cleaned it, by cycling water though it (that may or may not be the right thing to do, but that is what I was told to do) and put in a new ink. now, it is writing extremly schetchy - it will write a half dozen lines, and then stop until I give it a shake. any suggestions?