QUOTE(penburg @ Dec 17 2007, 06:28 PM) [snapback]450682[/snapback]
OK this is helpful. I don't have access to an ultrasonic cleaner, however. And I don't want to do damage to the pen (sentimental value). I've never replaced a sac before -- would like to, but don't know if I want to start with this one. I'm thinking I might punt and send it off for restoration.
Is it possible to put a breather tube in this older model that didn't have one originally?
It sounds like you've done a great job on this so far. Heirloom pens are by far the most precious. I'm lucky enough to have a couple dozen from various family members, and to me, each one is a treasure.
I'd hesitate to use an ultrasonic on any assembled plastic parts (like the section on a Skyline). I know a lot of people do so, with great luck, but I've also seen the result when things go wrong: crazing. Ultrasonics are good for some jobs, but just not right (IMO) for others.
If you're not going to take everything apart, the easiest way to remove dried ink from the section/feed/nib is to just soak the front end of the pen, nib down, in a small container of water for at least three days. A good friend suggested that a three day soak was kind of the magic amount of time to fully dissolve ink debris in feed channels. He was right. You can soak the nib/feed/section in a small plastic container like a pill bottle or a film canister. Start by filling the pen with water, so you can flush outwards when you first lift the lever after soaking. The level of water in the container shouldn't be above the point where the section meets the barrel. After the soak, flush everything by emptying and filling repeatedly with water.
If you do decide to take the sac off and replace it with a new one, it would be good to force water through the assembled section with an earbulb or a similar squirty device. Flush from both directions, maybe starting from the nib end (there's more room for gunk to come out of the feed channels than out of the nib).
It is possible to replace the breather tube. The original might be in the sac somewhere, but may be broken into several pieces. Or, it might never have been replaced the last time someone changed the sac (more likely).
Since this is your grandfather's pen, it's worth the trip to your local repair shop if you're not comfortable with any of this stuff. If you need a recommendation, I'm sure you can get a million of them around here.
Congratulations on owning such a wonderful piece of your own history. I hope it brings you great joy!
Cheers,
Tom