I find that the Easton 3D Super nock(different then regular Easton Super nocks) has the largest,deepest and smoothest throat of your S-type nocks.Fits your standard size carbons with a .246 ID.The Easton 3D Super nock has a .098 size throat and a smooth throat to give you a light snap with the proper size serving diameter.When I make my strings I like to end up with about .108 to .110 finished serving diameter to give me a light snap.My string of choice for my longbows and recurves is a 18 strand padded loop BCY-X served with .021 Halo.