Hello, I'm am new to this forum. I bought a Tintenkuli and would like some information on it. I have read a post from this website about the history of the pen, but would like to find some instructions. So far I have seen some pictures of the original instructions on eBay but they are in German. I am sure it is a piston driven pen becaus there is a twist knob at the end of the pen. How does that work? Where the ink go in through? The tip or just behind the tip? Any info would help. Please point me in the rite direction. I would appreciate it. Thank you