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Roller ball pen refill procedure: https://www.youtube.com/watch?v=OmyJEsU4Jgs
❌ uni-ball eye (pen featured in video: pen writes very faintly and unevenly, based on my experience and the other people who tried)
✅ stabilo worker (easier (simpler construction) and works fine)
@syndikalista good question. You use one? Good experience re-filling?
I only had a few experiences with fountains, and I found them not so simple to use as roller-balls.
@douginamug cheap Lamy or Rollerball pens are my go to. Either Pilot air or the first oft your two options
@douginamug why not go with a fountain pen when you refill manually?