instructions for stripping down a Diana model 6G here:
http://www.network54.com/Forum/670208/message/1324760036
and some older ones here:
http://www.network54.com/Forum/670208/message/1284834256
Your compatriots will advise on where to get seals in the US. If I were you I would not shoot it any more until the seals are replaced - in case you cause some internal damage to the pistol's piston/gears arrangement.
Good luck.
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