Justin....thanks for the reply on that one, I was not aware that there was an indexing mark.

In either case, I had shot the original Magnocks (the guy that NAP bought the rights from) and they were a very nice setup. I shot them on my spot bow for a couple of years with very good success. The relase tension for each nock is exactally the same, eliminating any sort of nock related variation in the shot.

Huntnfool....From what I have read although have not personally tested, you will loose speed due to the increased weight on the string, however Magnock used to brag that although the launch speed was lower, the arrow did not loose energy as fast due to less flexing in flight. Like I said, that was marketing literature and I had not ever actually tested it.