[quote name='LawrenceH' post='923945' date='Aug 13 2010, 02:45 PM']Wow I've been FAR more cavalier! On my bullet truss jazzes, I turned several full turns to get them roughly in the right area, giving the neck a bit of a flex in between to help it settle in, and fine-tuned the following day - but then the 75RI was very out to start with (not really engaged at all in fact). I guess it also depends on the thread size on the truss rod in question, but I found a quarter turn did next to b****r all.
On a (5-piece) Ibanez neck I never once adjusted the truss over several years and varying temperatures/humidities, but I think they're a lot more stable than typical Fenders. Certainly didn't see the flex I do on the jazzes when strung versus slack. I'd have thought those graphite-rod necks were a bit better in this respect though.
Oh and yes, turn clockwise to tighten.[/quote]I have set up hundreds of guitars and basses and have NEVER had to do several full turns.