Thanks Wrench. (And thanks for your help on the corrosion problem last summer. It all got painted out)
The composite prop is certainly worth a thought. I will check the price although I suspect it will not be cheap.
The FAA type certificate simply states that I must have a 76" Sensenich 76EM8S5 rotating within a 100RPM limit in ISA conditions. It makes no mention of what the pitch should be. Is the inference that I can change to a 62" pitch so long as I remain within the RPM limits?