KawecoSPORT Mini Converter for Sport Fountain Pens | Ink Converter with 0,47 ml Filling Capacity | Made to Use with Bottled Ink

It works well. A bit on the small side, but it seems to write for a while with the extra small nib.

I picked this up for my Moleskine x Kaweco fountain pen, which only came with disposable ink cartridges. I’m picky about what ink I use, and I wanted to fill it with Monteblanc black. This mini piston converter fits perfectly—no looseness, no leaking, no hassle.Installation was easy: just pop it in where the cartridge would go and twist the piston to draw up your ink. It holds enough ink for regular writing, and I haven’t had any issues with it drying out or skipping. The converter feels well-made and seats securely in the barrel. For such a tiny component, it makes a huge difference in how customizable the pen becomes.If you’ve got a Kaweco Sport and want to use your own ink instead of being stuck with cartridges, this is the add-on you need. Just double-check that your specific pen supports it—this one was a perfect match for mine.

As the name and description says, this is their "mini" convertor and they're being truthful. It's small so be prepared to fill it more often. But it works great, easy to install

It's fantastic at what it does. Since it's a mini converter it can only hold so much ink but the plunger portion you pull to suction the ink in is hard to grab. If they could put a lip on it to make it easier to handle that would be best.Other than that the product was prompt on arrival and I've had no issues with it.

My husband got a little Kaweco and decided he didn't like it. Me? YES, PLEASE to the little portable powerhouse of portable sketching! However, my plan was to take it out for urban sketching locally. Or even nature sketching. Either way, I use line and wash and the cartridges that come with it ARE NOT built for that. So, this little beauty was a MUST HAVE. Fill it with waterproof ink, pop it into your go-kit for some impromptu line and wash and away we go! Must. Have.

I normally don't write reviews, but I'm going to this time for two reasons. The first is because there are a couple of different options for cartridge converters for Kaweco Sport pens, and I want to help people decide if they're trying to decide. The second reason is, the USPS lost the package containing the first converter I ordered, and the seller was very good about replacing it at no charge to me, and I really appreciate that they did that, so I want people to know that the seller is good.As for the converter itself, it's a very tiny little piston converter. You don't turn a screw or anything, you just pull up on a tiny, knurled knob to draw ink up into the pen. That being said, in order to have room for the piston mechanism in such a small pen, you sacrifice about half of the capacity that you'd have with a cartridge. Your other option is a squeeze-type converter. The squeeze converter probably has about twice the total capacity in theory, but it's harder to get it to fill all the way, and it can be a little bit messy and frustrating getting the hang of it. The piston, on the other hand, is much easier. Since I generally only use my pen for writing short notes and so forth, the piston made a lot more sense to me. If you intend to write for longer, and are prepared for a slightly more difficult experience, the squeeze converter might be better for you.

Perfect clean works well

I want to like this, it's so cute and fits great in my brass sport, but I can't give it more than 3 stars. It repeatedly falls out of the pen while in my pocket and ends up rattling around inside the barrel, causing a big mess when I open it up to re-seat it. The small capacity isn't a problem, but the ink airlocking in the top of the converter is, especially when there's a 50/50 chance opening the pen to clear the airlock will result in ink getting everywhere. I'm going to try to find a spring that will fit around the plunger and seat against the body of the converter to hold it down into the section, but that's not something I should have to do with a brand new converter in a brand new pen from the same company.