i took minnflyer's advice, sanded alot of the clear enamel off, put the heavy blade opposite top dead center. started the engine and watched the prop as the throtle was increased.at just above a high idle it shakes and the tips go off track then come back in. the worst vibration is at half throtle ( the slave struts vibrate so bad there life span would be in minutes). the rest of the way to full throtle it's not good but alot smoother than half throtle. so, another prop is likely needed.