damn your delslo is having all kinds of problems! ever find out the deal with the milky film in your oil leak trail? by acorn nut, im assuming you mean one of the 5 or so long bolts through the valve cover to hold it on? with the curved washer over the black plastic piece? dont see why it would just keep spinning in either direction and not be able to just be pulled out. probably just need to try and cut the head off. in my case, if i didnt have anything to cut it, ide loosen all the other bolts and pry on the cover til the bolt broke, but thats not recommended....haha