Hey Guys, I have a problem , I winterize my 454 crusader engine and stripped out both drain plugs on block. Left side is right next to motor mount and can not be tapped without removing engine mount,right side is up againest the wall and of course under maniford. I purchased those rubber inserts with wing nuts but then don't go in very well and don't trust them,If one was to come off I could take on alotof water if I was not at the boat for awhile.Any ideas? Thanks