I agree with Jackcrafty and minuteman.The tile saw is the best tool for self-nocks I've ever used.(And I've tried em all).If you use cane for arrows,and like your nock to end up in a node,you can use the little groove under the node as a guide,and cut a straight nock.Then ,use the saw to enlarge the bottom,to near string diameter, to make perfect snap nocks. God Bless