I am an avid spearfisher and use bands on all my guns. I have 2 old Pnumatics that were aquired some time ago. Neither of them are working and I have no info on them. One is a Beuchat 850 and one is a pistol sea tech? They look to be made alike. I have disassembled the 850 and replaced the O-rings and freed up the trigger. I put it back together but dont have any clue on fluid or how to service it. Any help? Thanks