Who makes o rings these days? May those are better quality that the stuff meant for commercial vehicles. I wont bore you but Ive been trying to seal an air leak since December.... As an aside I worked on CF6s on the KC10, and the TF33. I did like working on the TF33 more. Smaller and easier to get around. The CF6 maybe...has a bad place in my memories over the number 2 engine on the KC10...because its like 5 stories up there LOL