Top positive review
on September 22, 2016
A knob. It fits and works. None of these after-market knobs details what the materials of the threaded portion and nut are. I got this one hoping that the thread would also be aluminum with perhaps a stainless nut. Not the case. Taking the gopro diving, and metal that is not stainless or aluminum will begin to rust very quickly. Even rinsing properly in fresh water wont stop this. The threads now show rust where the fresh water rinse could not get to them. It will probably last for a while with prompt cleaning but the search continues for a full stainless version. Im sure for most other uses, this particular knob will work just fine but not the best for scuba diving and salt water immersion.