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How to tell if a prop hub is spun?

I picked up a crab pot line a while back. I untangled and re started with no issues. A few hours later the prop quit spinning while in gear. Replaced it with a new prop. all fine. Other day I took the spun prop out of the box and looked at it. it looks and feels like new. How do you tell if a prop is bad in the shop? 9.8 four blade solas. THanks!
 
Mark a line that goes from the splines to the outer hub. Go for a WOT run. If the line has a shift in it, the prop is spun.
 
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