First time positing here in the pen forum.
Several years ago I inherited a small collection of fountain pens from a family friend who knew I was into them (never had anything valuable- some Shaffer’s and Esterbooks). Among them was a MB149, Dumas, 4 Doufold’s and a Waterman Man (all with boxes and papers). All were stored with ink in them, so I proceeded cautiously, cleaning them and reading threads on how to do it properly-slow soak and repetitive rinse.
The 149 cleaned up perfectly, took several hours of soak and the piston finally came free with gentle coaxing and easily purged from the nib until flowing clear.
With the Dumas, I was not so lucky. I soaked for hours and wiggled the filler and it would weep ink from the nib into the dish of water. I did that over the course of several hours and finally the piston started to turn, but then it started leaking watery ink from the back of the filler- which makes me think I blew a seal or something.
Mont Blanc obviously reccomends I send it to them for service, anyone have any advise on this?