Have access to a lighter? its not a blow torch, assuming you are over 18, you can buy these for under a pound.
Otherwise a gas hob could be used. But be carefull!

Once heated you can prise it off using the 2 screwdriver method. My one i tried last night came off easily with theis method. Is there a grub screw holding it onto the shaft too?

heat will be your friend here,