I actually did read your post which is why I replied. While you did quote the two-o-rings, it seemed you may have been also speaking more generally about the issue. FWIW, several in our club also add the extra o-ring, but I think I recall the older closures did not have two grooves, so it’s a somewhat more recent development.If you actually read my post, you will see I only addressed the issue of CTI supplying an extra O-ring. I never mentioned epoxy.
Sorry about my overly broad interpretation of your statement.