Following a week or so of repeated flushing with tepid water, I'm delighted to report that my Mont Blanc fountain pen (which was last used around 20 years ago) is, once again, working perfectly
Never had a Montt Blonk (Norn Iron received pronunciation) but I resurrected my 40-years-dormant Sheaffer a few years ago. It served as the spur to collect 20+ FPs, at which point I realized how trivial a pursuit it was, so now they're all gunged up again.
What I noticed was that whereas when I was at school you bought an FP at the stationers by the bus-stop, filled (oh, sorry, "inked") it and used it and it worked immediately, if you buy a pricey modern collectable* you have to send it away for nib work because only a fool would expect a new pen to work just like that.
*hah bloody hah