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I was one of the lucky recipients of the valve tool. I have used it and was very happy with it. It is so small that it can go in any diver's tool/spare supply kit.
I have found that turning the valve stem nut every 6 months or so, prevents corrosion problems with the stem. It makes changes the o-ring, handle or valve seat much easier if the nut isn't frozen to the stem.
THANKS!
Ok, this may be a silly question, but just how tight are you suppose to make spring loaded knob nuts?