Hi, someone with more brains than Haynes may be able to id this torx headed setscrew just below the cam cover on a Zetec blacktop at the rear of the block. I've searched the aforementioned manual to no avail. All I know is that it allows an annoying weep of oil down the block. It's clearly been threadlocked as there was a crack then it tightened. no oil leak now. But should I have done this? Any id please gratefully received.