Thanks to Hamble Propellers and their excellent service, I had a replacement propeller within two weeks – it fitted perfectly. Due to excessive tip chatter I had opted for a smaller diameter and pitch. Instead of the original 17″ x 10″ we had before (I could never reach the maximum RPM of the engine) we replaced it with a 16″ x 8″. We can now achieve the revs we should and it is MUCH smoother than before.
Shiny new propeller!