I removed the right side engine cover so I could turn engine, and a small threaded piece fell out, I think called an oil through( part 15441). Is this supposed to be loose and what's it for. None of the videos I've watched says anything about it. Should it be threaded into the bolt/shaft? It's got a round head and I don't know what to turn it with. Also, I've got the four headcover bolts off the cover but can't budge the cover. What should I do now? This is ridiculous.