In soaking the nib and feed* to be able to pull them from the section holding them for a good cleaning, I discovered that the feed was broken. The only thing holding it together was dried ink.
And, given the time period when the pen was manufactured, finding a feed that fits could be a pain in the ass.
Current tally: I need a new feed, and an ink sac. The presser bar is in sparklingly perfect shape.
*I'm assuming this isn't needed, but just in case: the feed is the plastic thing just behind the metal nib that brings the ink to the pen tip.
8 minutes ago