Also might be worth pointing out that the bottle in question may need looking at, if the regulator is starting to separate from the bottle, you could end up with a steel rocket in your hands...
Get it to a certified airsmith (usually people who do the fills at your local site/field) who can make sure the reg is tightened to the bottle and see that the bonnet is tightened down properly or advise of you're looking at a new reg/bottle.
Get it to a certified airsmith (usually people who do the fills at your local site/field) who can make sure the reg is tightened to the bottle and see that the bonnet is tightened down properly or advise of you're looking at a new reg/bottle.