OK, I did some searching on the site before posting this and I was not able to find the answer. Is there a uni-bushing that fits the Hammer head for the G nock? Does any one recommend using that or is the regular AD nock sufficient? The trouble I have had with all carbons is the nock. If I don't glue them in, they fly out on a hard hit and I loose it. Or, if I glue it in, it breaks off leaving the skinny part in the arrow. I have been experimenting with all kinds of carbons and I think the Hammer head will be my last experiment and probably my final choice from what I have been reading here. One other question. i am shooting 55#@28" how much has any one cut them down and corrected spine with more weight in front? I really don't want to shoot an arrow longer than 30". Thanks for any help.