"Capt T" wrote in message
...

Warm gently with blowtorch and tap gently until released.
It's on a taper

Thanks for that ---very awkward to tap anywhere beneficial and I have been
warming it to the extent that now the plastic is suffering.! Still I shall
persevere now I know its a taper. Thanks

If the plastic is distorting then it's stuck fast.

They can be a bit of a bugger, and unfortunately leverage usually breaks the
fan.