Turbo Nock is coming out with a "twist" nock that you can use with standard fletching. They say their testing shows it will allow one to use 50% less fletching size to stabilize fixed heads, cause the arrow to complete 2 complete revolutions in the first 7 feet of flight versus 5 feet for the standard turbo nock and 20 yards for a standard nock and fletched arrow.

Only problem I see is they will only be making it in the bigger super nock size, not g-nock . I won't give up my ACCs for anyone, but it should fit plenty of other shafts.

There's a thread going at AT in the manufacturers section for more detailed info...