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katerchen
271
Dec 26, 2018
I really like mine. Jumped on it soon after they showed up at the small US retailers. Paid full price too *sadface* The nib looks like a standard #5, so you can play with it to your heart's content. In fact : I was able to fit a Franklin Christoph nib unit in there (I had an extra SIG nib, which I now should treasure as there will be no more made with the passing of Jim Rouse :( ) Or you can just experiment with swapping the nib only. It's friction fit. Ink capacity is humongous. The eye dropper is workable but I prefer blunt syringes (so as to not get ink on the threads). One last thing to mention : this is a writing pen, not a quick note taker. The cap takes 3.5 (!) full turns to remove. EDIT: Here's a filling trick I learned. First of all : don't fill the barrel all the way : the section will need room to be screwed back in ... Also : on the first fill when the feed is still completely dry, only screw in the section enough that it won't leak. *then* turn the pen nib down and finish securing the section. This will force out a bit of ink, saturating the feed. Oh and do this over a couple of paper towels.
(Edited)
Ghostwriter
99
Dec 29, 2018
katerchenI'll add a point here: while these pens come with rubber o-rings to prevent any leaking, it doesn't hurt to be extra-careful and apply a little silicon grease to the threads. It's not a requirement but I like extra peace of mind. I love my Koloros! (I have 3 now).
jpelham
5
Mar 21, 2019
katerchenYou mentioned the nib's friction fit. Is the nib and plastic feed assembly as a whole secured by friction alone? I compare with Pelikan, whose nibs are friction mounted in the feed, but the nib/feed assembly screws into the section. Thanks very much.
(Edited)
Ghostwriter
99
Mar 22, 2019
jpelham> Is the nib and plastic feed assembly as a whole secured by friction alone? Yes. The nib and feed pull straight out of a black/smoked colored 'collar' within the section (I have no idea if the collar can be removed as well). The feed has a flat side at the bottom, so it can only be inserted by matching it up against the flat side of the collar. Hope this helps. Cheers!
jpelham
5
Mar 22, 2019
GhostwriterThank you. Just what I wanted to know.
katerchen
271
Mar 22, 2019
jpelhamYeah it's a pretty common nib assembly (I'd like to say Jowo). The entire unit screws into the section and then in the collar the feed and nib are friction fit. NB: There's a little O-Ring, try not to lose it when you take the assembly out.
jpelham
5
Mar 22, 2019
katerchenThanks for the insight. With one exception, my pens are Pelikan or have Pelikan-type screw in nib assemblies. The exception came when I was seized by curiosity and bought a TWSBI, to see if Taiwan's quest to match Japanese quality had succeeded in the fountain pen industry. But before long, the friction fit nib assembly began to work itself loose in the section, would not seat securely. The friction fit Opus nib, also made in Taiwan, could in your view have no such issues?
katerchen
271
Mar 22, 2019
jpelhamIs your TWSBI an Eco? AFAIK that's the only one that doesn't use screw-in collars. The nib and the feed are still German made though. I think if you find yourself changing nibs often, it makes sense to buy the entire assembly for a few bucks more, to avoid wearing down the surfaces that make friction fit work. Here's my whole nib unit taken out for reference: https://photos.app.goo.gl/vZobKS6KavZVkHgPA



jpelham
5
Mar 22, 2019
katerchenYes, it's an Eco. That it's the only TWSBI to rely on a friction fit is news to me. I had it only briefly before our 'falling out.' Maybe a faulty assembly. Thank you for the photo. The Opus nib/feed looks more substantial. I like the high capacity seal system, but will likely save for a Pilot 823 or Conid version. Thanks again.
Ghostwriter
99
Mar 28, 2019
katerchenHey, thanks for this. I was unaware that the nib-unit/collar unscrewed from the section like that. And props for the warning about the o-ring - that little bugger is certainly tiny. I like the engineering that went into this pen - no leaky bits between the nib-unit & section, etc. The Opus 88 team have done themselves proud as far as I am concerned. And yes, I'm fairly certain the nibs are Jowo - I just can't find where I read that now.