Ash ! if you check your manual it should tell you exactly where your speed nock's go and how to measure them .I've put a new string and cable on this spring as well ,I did not replace the speed nock's and to tell you the honest truth ,I don't think putting them back on make's a whole lot of difference and certainly wouldn't be worth the agrivation .For 2 or 3 fps I'd go without them .

nubo