Re: How do you detect air leaks?
Let the engine cool, grab your wrench by the head so the socket is coming out of the middle of your palm more or less and tighten it really well.
You shouldn't be able to strip anything holding the wrench like that.
If you have only box or open end type wrenches, hold it very near the working end and tighten the same way.
Tighten them in a cross, or "X" pattern.