"Roger" wrote in message
...

Why grind the blade is there is nothing wrong other than the leanding
edge needs polishing.

You need to visit a prop shop and ask them to show you what happens when
people think there's nothing wrong with a blade, and a tiny crack or ding
turns into an engine damn near torn off the mount. Or ask them to show you
what that seemingly solid prop blade looks like when seen with a high speed
camera and a strobe light. In turbulence.