arg troubles with CO2 tank +reg.

[spikehs]

I can't seem to get an air tight seel between the regulator and the co2 tank...There was a rubber ring which it said to use to help seel it (put it between the reg and co2 tank) which i did after some trouble - the nut would barely slide over the threads with the rubber ring around it. So I got it on and tightned it with a wrench and co2 is still getting out (quite a bit). I am assuming they will have the rubber O-rings a HD or Revy right? Does anyone have any suggestions (I got the co2 tank from JL and reg from SWC)?...Oh yah my bubble counter is broked, any idea where to get one? THanks.