Fair enough, thanks. So (please be patient with me), why then is a paper gasket sufficient on the rocker inspection cap, ie the oval-shaped cap held on with a central Phillips head screw? I mean, why do the two tappet inspection caps need to be so much tighter than the oval rocker inspection cap? I'm not doubting what you say, of course, and I am obviously very grateful for your help; I ask just in order to learn. Phil (novice.)