Starting the DSG service on my 2012 Passat. There is one bolt that connects the battery tray to the air box that has a star shaped rubber top. Not sure how to remove this "bolt" with a rubber top. Any help here would be much appreciated. Those of you that have done the DSG service will know what I am talking about. Is this just a rubber grommet? Haven't given it a good tug yet for those unkown reasons of what may happen.