I don't have access to a hydraulic press but I did try heating the outside shaft with a plumbers torch..... but to no avail. I think I will just leave the two shafts seized for now and perhaps have a go at it again in the summer. I am afraid I might damage the threads on the shaft. I also don't know how much I would use this feature as you have to manual tighten/loosen the assembly. At present the machine isn't very difficult to manoeuvre.
I was also wondering if anyone knows of an retro. kit that can be purchased to add a remote chute angle adjustment? Currently this has to be done manully by loosening a clamp, making the adjustment than tightening it again. This is one feature that would be very nice to have.
Thanks again for your suggestions and have a Merry Christmas.
Mike