I tried the Dave Brown Vortec spinner first and used it for a little while. However, with my YS91, the prop nuts would hit the inside of the spinner, not allowing it to make full contact with the back plate. It was also my first attempt and the cut-outs did not go as well. The TruTurn is a little deeper/longer and uses a slightly thicker back-plate. When I tried an APC 16x4w, I ran out of threads on the shaft before the prop was tight. A thicker washer just made it hit the inside of the spinner. The Dave Brown spinner had to be cut as well. The price difference at Tower is $18.39 vs $24.49. I wished the Dave Brown had worked out better it just didn't fit right for me.