I am again a happy diesel guy. I did some testing with the PAW 19DS, seems like it likes the Master Airscrew 9.5 x 6 prop best. I started with the Top Flite power point 10x6 that kinda worked before and it was not happy at all, the vibration was so bad I could hardly hold the compression screw to make adjustment, finally it quit. I then changed to the MAS 9.5x6 and it was like a totally different engine, smooth and powerful low vibration just were I wanted it to be. Any ideas as to what could cause this kind of drastic change? (the prop was slightly off balance but this should not have been enough to cause it to shake this much)