i have 50 k on my firerings, but i went through 2 sets with the 12mm studs. switch to 14's and prob solved. i have the rings that leaked and you can see a difference with your eye on how they crushed not only from #6 down to #1 but there is a difference on each side of the same ring on # 3 and 4. just not enough clamp force for my application, 135ftlbs. now they are a tad higher. j