BLAZER vanes hit the bottom of groove.
this is do to height.

i could not see where it affected the flight of arrow BUT i am funny to those things ,so i took a razor blade and cut a little off the cock vane so it does not touch bottom.

i see big difference in arrow flight out past 20 yds with blazers.

arrow seems to fly faster andflatter.

i can see this because i watch arrow all way to target at 30 yds thru scope.