To me, the markings left by my Stronghold chuck are not acceptable. If you
click on Leo's picture "There is no indication of any destruction caused by
the Stronghold chuck !!!" at
http://homepage.mac.com/l.vanderloo/PhotoAlbum26.html , you will see the
marks left by the chuck jaws. It is up to the individual to decide whether
these are acceptable or not. I prefer to have a radiused recess.

Derek