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I thought it would be interesting and potentially helpful to share this since I searched for converters that fit this pen but I couldn't find any. Result-wise, this is what it looks like and it works but with a little caveat, which I'll get to in a moment. Here are the steps: I started off by drilling a hole near the base of the piston stem. Then I cut off the top of the stem with a box cutter. Next, I threaded a bundle of string through and tried to push down the piston. However, the collar fits snuggly around the stem so the strings got stuck. So does the piston. To solve that, I polished the inside of the collar and the two sides of the stem with micromesh, so that the strings can fit through. Finally, it can be assembled together. I also polished the back of the stem such that it's more conical and less flat. It helps the stem to not be stuck by the collar. It does indeed draw up ink but you might have noticed a slight problem. That is you have to have a thin rod, which is a separate thing that you have to carry around, to push down the piston. It shouldn't be a problem on the desk but it's something extra you need to remember if you want to refill on the go. Length comparison: kaweco modified, international short, international long, international converter(top to bottom)