I have the TruTurn 2.25" spinner on my YS91FZ. I have used both the APC 15x6 and the APC 16x6 in it. You have to cut the slots bigger but otherwise it is working fine. I used a dremel tool with a cutoff wheel to enlarge the slots. The two nuts come close to the end of the spinner but its working fine (I can't remember, but I may be using the Dave Brown spinner adapter - one of them is shorter than the other) I have lots of flights on it now. I have also used it with an APC 16x8 propellor (temporarily had a YS120 on the plane) which is why the cutouts are a little bigger than needed.

Chris