one of the first TV's that I mounted....had a hell of a time with a stud detector and just getting littel transient stuff in between the studs....in frustration i took my best guess and mounted that TV (42" Fujitsu) and got it centered and lined up just so.....until the homeowner flushed a dump and a small brown trickle emerged from behind the TV.
Never guess in frustration.....
Jack Rainey - Full disclosure...reformed integrator, now mid-Atlantic manufacturers rep for: Integra, Paradigm, Anthem, Parasound, Atlona, LG TV's and Metra Home Theater...among others