Ian's updated reel roller

I made a small improvement to Airtripper's great Reel Roller ( http://www.thingiverse.com/thing:21435 ) to counterbore the screw heads and provide nut pockets, both to clean up the exterior and allow me to use M3x25mm screws, because the only screws I had longer than 25mm were 40mm, and they stick out comically.