What you see is evidence of an experiment in progress; come the morrow, I'll be finding out. First: the instrument, as found, after cleaning, soaking, disassembly and removal of nasty-crunchy bits of old internals, shown along with some parts and supplies. Yes, the ink reservoir -- the sac, as 'tis known to the trade - had perished. Thanks to a pair of dedicated and loopy-in-a-good-way enthusiasts, this isn't a total disaster. You can still get the parts.
Section and sac assembled, waiting for the Secret Mystery Glue (clear shellac or nail polish) to dry: This was an inexpensive pen when it was new; I picked it up with another pen (an Eversharp "Zenith" with a mixmaster cap, in fair working shape) at $14 and change for the pair. For having even an inkling of how to go about fixing the non-working one, all thanks to Da Book!
This is one of those rare, hands-on, essential texts, like W. R. Smith's How To Restore Telegraph Keys, Horowitz and Hill's The Art Of Electronics or anything by Frank C. Jones or Patrick S. Finnegan. If you're going to do much with fountain pens -- or stylographic pens* -- you need a copy.
Of course, it helps to have a backup, in this case a shiny-new pen. I don't know why I'd never purchased a Lamy. They make a full line and their inexpensive pens are an especially good value; this one has a nice feel in the hand and on the paper. The clip's distinctive and should hold up. (I'm running a converter filled with Noodler's black ink, the latter having been highly recommended by Marko and received good mention elsewhere).It's a clear "demonstrator." I have a real fondness for them.
* Don't know what they are? See, that's why you need Da Book.