Hi everyone. A few months ago I received a Parker 51 Vacumatic as a graduation gift from a family friend, and it's since become one of my favorite writers and the centerpiece of my EDC. However, I ran into an issue yesterday with the filler unit. When I'm depressing it, it feels as though it's grinding or like the spring is having some kind of issue, and, most peculiar of all, a small quantity of ink comes out onto the plunger knob when I bring the plunger back out. The ink still fills fully and holds ink, but could the diaphragm have begun failing, or could this be an issue with the entire unit itself? In that vein, for repair work, would it be more economical for me to just send it to someone for repairs, or to try and do the repair myself? Thank you!