How is it that the seller had to or was supposed to know there was something wrong with them? It took the buyer six months and for someone else to inspect them and say there was a problem. Like i said before it would very easy to buy a set, test them, determine they were wrong, sell them and move on without a second thought. Honestly i still think you are being a little harsh on the seller for none of us knowing that side of it.

I still think they are to much prop for the 330's in that boat. If you cant spin cut down 24's you will never spin a fresh set. Its common practice to cut down the diameter to allow them to pick up RPM's. I had this done on a set of 5 blade Herrings to allow the motors to pull all the way to the rev limiters. If anything you should be able to spin them easier.

Not trying to throw stones, just putting up a few of my thoughts as i read the responses here.

I see you still only know how to drive a boat slow!!!!

Lots of ways to see if a prop is good or not. One is check the diameter. The other is they make prop pitch checking micrometers. This will allow you to see when a blade is folding over. They use them at races to check for cheating.

so what happened to these props