What I'm curious to know here, is what exactly we are trying to find here. Is it this "seam" that is created from the construction of the shafts? If this is the case, I think I just found it on the Gold Tips. Inside the arrow, you can definitely notice a seam if you use a flash light.

I am under the impression that it is the seam, which in theory is the heavier part of the each shaft and should be the part that goes bottom down if you float them in water.

I don't know, I'm grabbing at straws here, but I want to get a better understanding of this.