Here guys heres a pic of my fixed axle which remember was broken in half where the pin goes in, Now remember like i said the screw would bend on me occassionally and i would have to replace it, but this was on a broken axle not a solid one! On a solid axle it helps strengthen it.

http://www.magnut.net/brokenaxle.jpg
http://www.magnut.net/fixedaxle.jpg

http://www.magnut.net/axlebroke.jpg