I've just got my PT out to give her a wipe down & noticed play in the cylinder, it moved! I then noticed a gap between the rear of the cylinder & the Regulator, a slight exploratory twist resulted in escaping air! I tightened the cylinder up as much as I can with my hand but how tight SHOULD it be considering the pressures involved, do I need to tighten it with grips & a vice or some other sort of tool? I'm not really much of a Gunsmith, my maintenance extends to the greasy rag. Any advise would be much appreciated.