I am installing compression fittings throughout my setup, and I am wondering how hard do I have to tighten them? Hand tight ok? I also had to move the inlet port on my Swiftec XT CPU block to accommodate the compression fittings. A pain in the butt tightening those tiny screws but I just don't want to over do the tightening. Should I be watching for specifics on the rubber ring at the base of the compression fitting?