Guess I didn't read right and posted this under HB German.
I am building a p-51 and needing to buy an aluminum spinner. They all have a prop hub inside that screws onto the prop shaft, but I need to know what is the diameter and thread size of the prop shaft on the hp 61
This is the Gold Cup 61 with sliding carb but I don't know the year. I think the model or engine number has ? 7704 on the mounting platform. Hope this will help.
Thanks,
Doug