Far greater gains to be had doing such an o-ring mod versus the traditional o-ring gland addition, ala Benji Airsource. Such an addition is a direct flow seal. The other method, an o-ring forward of the hole placed radially, like the rear, still presents a 'void' to be filled with air/pressure.
Fantastic! You got it, without me having to tear down my 392 to show people.
"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."