woo hoo, cheers guys. This was my method - a bit of cloth over the plastics to provide a bit of a puffef the pour a kettle full of boiling water over the nut.This was then followed by several big doses of " shock unlock" lubricated freeze spray around the area then the gas microsortch on heat gun for 5 minutes. Don't use the naked flame as the freeze spray is ether. Then with a correct sized allen key, sloted in long end in, lay the gun on its back and rotate e nut towards me and give it a big FOAD, but smooth pull. Repeat this process a couple of times and once it moves it comes off with eas