The mainframe and back have been split. There was a cock up with the tube cutter as the cutting wheel had a chip and wanted to track to one side so the brake clamps were utilised as guides for the hacksaw. one new 32 tooth blade made short, clean work of it.
That bloody insert didn't want to budge and we found out why.
The insert was tapped and that was interesting holding the frame in the vice correctly to ensure proper tapping; the camber height adjuster came in handy
A threaded slide hammer was cobbled up but that failed to make any impression. Next was to machine up a support collar and with some HD washer and nut, the insert was drawn out.
There is plenty of galling from it being forced in dry which is not surprising; it is not meant to be removed. There is no such excuse for them dry fitting the bloody fastenings. No lubricant used there at all.
Tomorrow the second insert will be removed, the tubes will be lightly reamed then the solid extensions will be machined to suit.
A couple of images.