Hi bitmonkey, may I suggest that you fill in your profile. It is unlikley as a newbie that you will get the information you are looking for until you do so. It's not that you may or may not know what you are doing BUT nobdy knows anything about you so your request may be met with some hostility. However IMO you wouls be better taking it to a qualified gunsmith. You are dealing with a compressed cylinder and it wouldn't be pleasant if it went bang in your face.
Oh and by the way,, Welcome aboard.