Hi everyone, I'm flying a superstar 40 trainer plane,and always been using a 10x6 Top Flight propeller with no vibrations an being a beginner I've been through a few. The guys in the club told me that I should switch to a Plastice type prop which I did (Master Airscrew). I bought a balancer an always made sure that the spinner and props are balanced correctly, but everytime I put the Master Airscrew on the plane I get a vibration, an when I switch back to the Top Flight the vibration goes away. Is there any explanation as to why this happens? All nuts, bolts, screws on the plane are tight. And the Engine type is an OS FP max 40. the Vibration is at lower rpm 1/4 throttle or less an nothing above that from what I can tell. Thanks again for any advise and support.