You can certainly use c'sunk bolts; just don't over tighten them. I think they are much cleaner looking than raised heads.

I did notice that the screws were little more than finger tight when I extracted them. My thinking is that I'll stick with countersunk holes when I put in the new windows. I prefer that look to a washer on the exterior. But you can be sure I'm going to be veeeery careful. David =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= David W. Wood -=- dwood@dwoodworks.com 1981 M15 -=- Hull #163