Quote Originally Posted by Chrissy View Post
It looks like your sac was quite thick as you can see the impression of the lever in it. I've not seen many sacs but it would seem to be counter productive for the lever to make such a heavy indentation into the sac.
That's a good point. I guess the previous owner wanted to try to maximize ink capacity, but in such a little pen there wasn't much of a point. Makes more sense for me to throw on a #15 (which I already happened to have a spare of just the right length to almost the end of the barrel) which should allow for some insulation between the walls and sac. The pressure bar is a straight bar with a bezel that slides over the lever (it rides the bezel as the bar gets pushed in). So this way the wall nor the bar are even touching until the lever is moved.

This course might explain why about 3 or so years ago in the winter during note taking the pen was prone to burping, with no insulation at all it wasn't much different than using an eye dropper with thin walls.

I'm just glad I took a look at the sac before deciding to ink it up again.