If you can understand my quick Microsoft Paint drawing. The screw has a shoulder area. Drilled through the screw is a hole which then takes a 90 degree turn. Due to the dynamic nature of o-rings, the sealing surface would then be upon the drilled hole and the thread area if the thread area should allow air bypass. However, since the screw is a shoulder design, the idea is to seal the threads off and allow the air to only pass through the drilled hole. May or may not work.
"The majority of things in our lives are created by folks no smarter than the rest. Afterall, the world is comprised, and operated by C average people intellctually, academically, and morally. These people are often the great pioneers that set the precedent for what excellence should be."