Piston filler repair tips?

[amk]

I have both Da Book and the more recent Marshall/Oldfield opus, but neither seems to give very much help on piston fillers. Which is annoying, as I have a lot of wannabe Pelikan knockoffs (and a few nicer pens, like a Melbi and a couple of vintage Kawecos) all waiting for an overhaul.

Do any other FPGeeks know of a good resource for piston filler repair tips? (It may be in German: if so I can read German, but with great effort and frequent recourse to a dictionary...) Or any good repair videos?

[Chrissy]

What I generally do is to search for repair of a particular pen in Google to see if something comes up. I know Stephen Brown has some videos of Pelikan repairs, but although I tried to find one for the M400 or M600 models I don't think I ever did. Some Pelikan M800 pistons can be opened with the use of the TWSBI tool but I don't have one of those, so I can't confirm it works.