Spent a little time on the mill thinning down 16 repair washers which are going to be welded to the inner uprights around the height adjustment holes, to reduce slop and add strength, should produce a sliding gap of about 1.3/1.5mm.
Plus flattened the mounting plates for the bottom of the outer upright these will be welded on and then drilled for bolting the upright to the U channel.
Welded the bottom upright plates on today and drilled the U channels to suite.
Took longer than I expected due to my own stupidity, welded one of the plates 90 degs out, so had to cut it off, 9" angle grinders rule and start again.........................