Sorry for the delay in feed back but excellent advice. With a clockwise twist, the locked nut came off. Obviously I had been tighting it on even more before!!
Stage two of the problem! It looks as though the fan blade should just slide off the motor shaft, there are no obvious things holding it on. however, the fan blade refuses to slide off the shaft. Brute force does not move the blade at all. It has an appearance of being rusted on?
Any thoughts - advice to get me past stage two would be greatly appreciated.
Thanks
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