I am replacing my oil seal carrier when I do my impeller at the end of the season.I am chasing a small leak that refuses to show up with a pressure test .The mechanic at the marina says it is most likely the carrier seal as he has replaced lots in the alpha gen 2 ....but...he says he routinely drills thru the holes on the side of the seal to let water drain out as the drive is tilted ...these are the holes you use to pop the seals out ...he says the water left in there can freeze and weaken the gaskets .....anybody ever do this? regards,Bob