Needing a little help here... I'm in the process of changing my spark plugs. I have the front one in but can't seem to get the boot all the way on. I'm replacing them with NGK 9s and was wondering if it was normal to have a little bit of the white showing on those plugs or do I need to keep trying to push it down. It seemed like it snapped in but there is about a 1/4" of white showing on the spark plug. Thanks for the help.