Re: N A S A We have a problem!!!!!!!!!!!
So the stud was stripped? Typical.
You probably have a head gasket leak. Research the aluminum paint trick and use a new gasket. Maybe get 4 new studs, so you can torque it up good. I went to 20 ft. #'s on mine, but they are 8mm. Sealed tight.
With 6mm......hmm......maybe 14 max.
LUBE and Compress the rings as you slide the cylinder on carefully.