I have a P4 1.5 I took off the HS and noticed some high spots on the cpu. It scratched the hs, plus the cpu code seems to be stamp in I can feel it. My concern is that there is a hole in the cpu. (I read in a post this is to let gas out during manufacturing) Do I have to worry about getting anything in this hole. Can I use alcohol to clean it out? Is lapping the cpu a bad thing?