Wheel
Gentleman, again many thanks.
As DALMD-11 has flown the aircraft then rudder trim sounds like the definitive answer. There's always an answer if you ask the right bloke.
Thanks also for the info on the loop aerial tuning. Now you mention it I can remember such an item in the Beaver used by the AAC in which I flew as a pax in the 60's.
Much obliged
Boslandew