Not sure if these add much to your understanding but here are a couple of pics.
Charles, I think if you use epoxy as described it will come off on the threads in the oil gallery before the plug reaches its final resting place, and thereafter slowly flake off into your oil (albeit on the right side of your new filter). I would suggest dabbing a bit of Loctite into the oil gallery through the (now enlarged) oil pressure gauge hole, just before the plug passes it by.
n.b. if the elbow hose fitting protrudes even slightly into the gallery thread then the plug can't possibly come out past it anyway.
Charles, I think if you use epoxy as described it will come off on the threads in the oil gallery before the plug reaches its final resting place, and thereafter slowly flake off into your oil (albeit on the right side of your new filter). I would suggest dabbing a bit of Loctite into the oil gallery through the (now enlarged) oil pressure gauge hole, just before the plug passes it by.
n.b. if the elbow hose fitting protrudes even slightly into the gallery thread then the plug can't possibly come out past it anyway.