if you simply take a two seam fastball and turn it over will it naturally sink?
Turn over? You should post that question here: http://www.letstalkpitching.com/phpBB2/viewtopic.php?t=7366
Elaborate and post it there. Maybe Hutch should add a Q and A section to the 2-seam/Sinker FAQ. He can combine the best answers in his thread.
If its not too much to ask a Mod should change the sinker/2-seam FAQ, theres an updated v. 2.0