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Peter, I'm following the IAP tutorial on this page. Nice and detailed, and loads of pics. Apparently the principle of the breather tube is that when you squeeze the sac air moves out of the breather tube more easily than ink moves out of the feed. Then when you release the sac both the feed and the air passage are under the ink, so ink gets drawn in to replace the air.

[QUOTE="Jimjam66, post: 27149, member: 58"] Peter, I'm following the IAP tutorial on [URL="http://www.penturners.org/forum/f139/iap-library-pens-77365/"]this page[/URL]. Nice and detailed, and loads of pics. Apparently the principle of the breather tube is that when you squeeze the sac air moves out of the breather tube more easily than ink moves out of the feed. Then when you release the sac both the feed and the air passage are under the ink, so ink gets drawn in to replace the air. [/QUOTE]

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