So after owning my Starwalker for a couple of years, I got sick and tired of buying ink cartridges. They never lasted long enough and cost so much more than bottled ink. I would have happily bought a piston converter the day that I bought the pen, but for some reason Mont Blanc does not make one for the Starwalker.
So I just put up with it until yesterday, when I stopped into World Lux in Seattle and they happened to have one piston converter for a Meisterstuck in stock.
I bought it, went home, and got to work with the Dremel tool.
I now have the only Starwalker piston converter! It isn't "polished" but it is invisible inside the pen, so I don't mind. And now I can finally use my favorite pen that much more.
Pics of the converter when I get home!