I too would suggest that you put on two (tied on) nocks if you don't have them already. I just take off an arrow nock and stick it on the string at the right spot, then tie on the top knocking point. Shoot the bow a couple of times to confirm placement, then put the arrow nock on again and tie on the bottom nocking point with just enough space to allow the arrow nock to spin easily around the serving. If you tie it on tighter than this, the nocks will pinch tight against one another at full draw. I use serving material but I know a lot of folks that just use dental floss for this.