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I have a Pelikan 400 tortoise (one of the modern re-releases) with a friction fit piston assembly. The piston got stuck and I assumed there was dried ink around the piston head. Curiously there wasn't. Even after knocking out the piston mechanism I cleaned the barrel with q-tips and there wasn't any sign of ink. I put it all back together, cleaned everything, put grease where grease was meant to be....a problem emerged. The piston nob won't screw down tight to the barrel. When I turn the nob to plunge the piston towards the nib, the piston won't go tight to the end of the pen like it used to. Instead there is a short gap just before the end of the barrel and the whole assembly at the other end unravels and falls off, as if the piston spindle is pushing everything out. That is, the nob and mechanism that slots into the nob, but not the section that friction fits into the barrel. So the whole thing comes off in my hand. I tried to re-seat the piston mechanism entire by knocking it out again and putting it back together - same issue. Can anyone help, with straight forward, easy to follow instructions?