If you play the oboe or any or any instrument with adjustment screws, and you are not trained in proper adjustment techniques, I would advise against fixing or turning them on your own. It is easy to turn a small problem into a larger one with the slightest turn of a screw (this includes all screws perpendicular to the oboe).
If you are experiencing excessive water in your octave vents on your oboe, we have something that may help! When you bring your horn to us for repair, we can apply a thin layer of silicone inside the octave well and cap, which will help repel water. This technique has seemed to help others in the past...please inquire for more information.