Thanks guys for the reply's . The thing about it is , we strive to get perfectly matched arrows , cutting them square and the same length is easy for me , fletching them I dont have a problem , but nocks are a diferant animal . They can look and seem to fit perfectly , but changeing one can result in atleast a 3" diferance in point of impact . So I guess the moral of the story here is if your haveing consistancy problems from arrow to arrow , make sure you put new nocks in them , given that they look fine otherwise . Or change your nocks and change them often .