I found this article on another forum and thought it would be of interest to my fellow T2 users and F75 fans as well. I know I have found iron trash, scanned the hole again and found something else that was good in the past, the article at the link offers some very good insights. Enjoy!
http://www.dankowskidetectors.com/behindthemask.htm
http://www.dankowskidetectors.com/behindthemask.htm