Thanks Gadge, I fitted the new engine today and it is running great. The old one I will put aside for parts.
This time I did put 4 blades on, but the vibration is still there. It is the plate that is at fault.
I have never thought to check for wobble in the plate. So I will do that after lunch.
Cheers hey
From Mark


Happy is he who penetrates the mystery of things.