Hi, I had a 10 x 5 prop on my OS 40fx engine.. It was in my Eagle 2 trainer. I was told that a 11x5 would be quieter and pull it along just fine. The problem is I can't find a spinner that fits the 11x5. I was told I could trim away some of the plastic spinner to make it fit. Still didnt fit so I purchase a bigger spinner and removed some of the plastic... This made the spinner spin out of balance.... what would be the correct spinner for this size prop.... ps I am using the gray plastic prop....