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I have a Criterion pen that looks much like the one in this corgicoupe post: https://www.fountainpennetwork.com/forum/topic/289264-criterion-from-the-pen-show/?do=findComment&comment=3338421 It says "CRITERION" on the clip and "FILLER" on the filler lever. The nib says: 14KT (or maybe 4KT) ALC9 O3 The sac was just flakes and powder so I'll need to replace it. I have a few questions: 1) I can't really see if I've successfully scraped out all of the previous sac - how can you tell that you've done this part correctly? 2) There is some rust/discoloration on the barrel where the cap touches it when closed, both on the threaded and smooth sections - Is it safe to remove it and what should I use? 3) I'll try measuring in order to determine what size sac to use but it would be handy to know the right size - any idea? 4) The nib works as a dip pen - does that mean it's okay? 5) If this were the only pen I ever worked on what would be the Minimum Viable Repair Kit - the least number and kind of tools and supplies that I'd need? Thanks for your help.

Hello: I recently dug three fountain pens out of the back of my closet. One worked fine but the other two will require sac replacement. I've bumbled around the richardspens.com website and it looks as if I can handle this task as I'm not working with anything particularly valuable. Is there a FAQ for this forum that covers sac replacement so I don't waste people's time posting questions that have long since been answered? Also when dealing with multiple questions about multiple pens is it appropriate to ask them in a clump or is it preferred that one restrict oneself to a single pen at a time (or even a single question)? This can go one of three ways: I can fix the two pens and quietly fade away, I can fail miserably and give up, or I can become pathetically addicted and start spending vast amounts of time collecting and refurbishing fountain pens. One never knows. Thanks, Chouffleur