Roger 

Bomo, This particular obsidian is pretty shock resistant.
Especially when wrapped tight fo the flutes.
I actually hinge fluted both sides. Neither side had much of 
a ridge. The second side actually was wavy from deep thinning
 flakes and the flute did hinge but was short. It almost 
disappeared when I shaped the point.
The gloss of the material absorbed the flute shadows in the photos. 
Zuma