Hatsan vortex piston fix

I know it's a bit dated, but I just came across this thread from researching my dead Hatsan gas rams. I have two that worked fine when I put them away in the Fall and are completely dead when I picked them up to use them this Spring. One is my Hatsan Edge .22 and the other is my Mod130s QE 0.30. The Mod 130 has hardly been used at all. Apparently you shouldn't store them tip up. now I know.... Is there somebody here who can rebuild them for me? Possibly Richfromohio?