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Easy to tell if the prop has spun. Just put a little file mark on the edge of the prop hub, and a little knife cut on the rubber hub next to the prop mark. If the hub spins the two marks won`t match up. Don`t pay for his time to test that, just borrow a prop and test it yourself. If the problem is gone completely the prop was your problem. However, not likely. How does he charge you, has he checked the controls completely and ruled that out. If not, a water test will probably tell the story, if he is a good mechanic. I hope he isn`t charging you for thoughts that pop into his head as to the cause of the problem.LOL

rich