Was playing this weekend and my reg unscrewed from the bottle, obviously its vented the air. Ive been playing for a couple of years and its never happened before, people were telling me its common and to just tighten it up with a vice, is it safe? Thanks. X
Don't use a vice, use a cloth and a strap wrench if you feel the need to tighten it up further than hand tight. Replace the o-ring with a new one. Don't use any sealants or joining compounds.
TBH the pressure of air in the system should prevent it from unscrewing.