On 30/08/2020 07:46, harry wrote:
It's the temperature/expansion difference that will free it off.
You need the application of strong heat to the circumferential parts.
If the whole thing is warmed, there's no expansion difference so it's less likely to work.
So you want something like a gas torch applied to the bit that needs to be made bigger.

Now sorted, many hundreds of taps with a hammer, WD40, oil, wooden
wedges, clamps, vice, heat gun....but got there in the end.

Just one more piece to free, the jaws on the chuck (image 2)


https://imgur.com/X7wWRFd

https://imgur.com/X7wWRFd