I am on my second attempt at replacing ink sack on a pen. First time I ordered a few sacks in sizes recommended by measuring the section in a hole card and by millimeter. What I ordered was size 15 suitable for a section about 5 mm i diameter. The sack I received in the mail is narrower than the one originally in the pen. I have watched a few tutorials on the web and I wonder if a bit of test and trial is involved in this? I now lean towards going for a sack which fits the section and goes pretty much flush with it, fitting snuggly with out much stretch. There seem to be enough of room in the barrel for the ink sack and the pressure bar.
I have a twist filler (missing bladder and nothing to compare with), a lever filler and a button filler to sort out; all using a basic vaccum filling system for the rubber bladder. Does this seem like a reasonable approach? The sack will be a bit larger than what the hole card recommends (at least compared to what I received in the mail).
Are there finer points to this?
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