Fluting was accomplished using a simple version of a Sollberger jig....pressure flaking that flute off.
Check out this video...paleomanjim is using a complicated jig, but at about 6:30 minutes into it, he explains how the nipple platform is isolated and set up for flake removal.
http://www.youtube.com/watch?v=DAf4I...feature=relmfu
Other videos show process for free-hand percussion removal of the channel flute, and great techniques for making other points.
Save your first point to compare as you progress to "master knapper"...the first always looks like a short chunky football.
Hope this helps.
Keep up the great work!