ewolf. I agree with the added weight. I shoot XX78 in 2514 with 125 grain broadheads. I guess my point is, when this gentleman wraps his arrows will he retune his set up? I would think not. Nex hunting season he will be wondering why his arrow doesn't hit the same spot and all the pin setting are different. Swamp Dawg had mentioned about 8 to 10 grains of added weight. I have no idea how much they acutally weight, but a nock is 5 to 7 grains with the insert.