Kaweco Mini Piston Converter for Sport Pens

People say this is not a good converter, but I think it’s fine. It is small, because the pen is small, but it definitely does the job! I used Iroshizuku ink in it and the pen was a dream to write with.

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

Fits perfectly and easy to use

The design of this converter is simple and easy to use and install. The quality is good and will last with proper care. The size is smaller than your standard Kaweco cartridge refill, but you still get to write a good amount before it needs to be refilled. Overall, great product and worth every penny.

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.

it is very sturdy for its size

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.

Works great just make sure you have the right pen to go with it