In the past I have had a brass nock set along with my D Loop but when I went to my local pro shop who I trust very much he said he has been using just the D Loop for many years now with great success. When he tunes and needs to adjust the nock height he just spins it up or down the serving like a nut and bolt. I know that everything added to the string just slows things down but I am fearful of the D Loop moving on its own too easy. What do you all think.