Lumenoks. I used the flat nocks on my excal. Awesome! New x-bow, Stryker Katana 360, w/ moon nocks (Lumenoks) I cannot get a consistent/accurate shot, no matter what... Well, field pts. are not to bad. But BH, forget it!! Shafts are squared, nocks are properly aligned, no fletching issues... Also, after several shots, I started noticing scratches on my rail... WTH?? The contacts on the nock was rubbing against the rail. I tried to turn the nocks a bit, however the nocks would not align properly... Now what?? So much for using them, I guess. Anybody else ever have this happen?