An often forgotten aspect of tuning a bow is correctly fitting the nock to the string. Most brands of nocks will only come in two sizes: small or large, which makes it a simple choice to choose the correct nock for the string, right? Unfortunately there are more factors involved, such as the diameter of the string material itself, the number of strands in the string, and the diameter of the centre serving.
You can construct a simple device to make absolutely certain of nock fit, and easily find even a small amount of damage. This needs an old arrow, a ruler, a piece of plastic tubing, and a few other bits and bobs. Bow covered this previously, and you can find the instructions right here: