[QUOTE=Dave Severson] (Cigarette smoke works great as a leak detector when things are pressurized with air)

That brings back a memory. At work one day we were mig welding with brass wire. It really throws the molten weld balls. A friend of mine got a braze ball in his ear, and it burned a hole in his ear canal. For a month or so after, everytime he smoked, you could see smoke come out of his ear. Thanks for the memory Dave.