Posted 06 April 2018 - 22:26
No long-term experience for the 2nd question but I've flushed my pen a couple of times and good luck getting the ink and then the water out of the barrel by simply operating the vac.
Both ink and water get trapped in the barrel easily, either because the vacuum isn't strong enough or because the breather tube is long and crooked and they can't reach it and so exit through the nib.
I had to pull out the nib and feed unit both times I flushed the pen. Be careful during this operation because if you put the feed unit back in the wrong way, you'll screw the hood in the wrong way too, always, no matter how you start to screw the hood onto the feed unit. So somehow mark the position of your nib before you pull it out.