if you do use the quick spins get ready to sight your bow in all over again. the degree on a pre fletched arrow it 1 degree. the quick spins even when put on a 1 degree spin your arrow as if they were on a two or three degree spin. this will slow your arrow down quite a bit. i have arrows on one degree and arrows on two degree. an arrow with a one degree vien on it shot at fifty yards hits dead on and an arrow with two degree viens shot at same distance using same pin hits dirt about five feet in front of target.