I just got a used spyder rodeo, from my uncle, gave it to me for free, but it has a leak. It leaks from the regulator section. I put a new o-ring in (the old didnt look that bad though) where it connects to the rest of the gun, but it still leaks air. I think the leak is coming from not where it connects, but on the regulator section itself. I don't know how to take it part, any ideas?