Here you can see the fixed and slider tubes after the overhauling. You can notes that the fixed tubes has been lathe rectified for about 4/5 of the their length, meantime has not been modified the gauge of the remainig 1/5 in  the upper part, to not compromise the possibility of firm clamping the fixed tubes itself into the lower fork bridge. You can also notes the two upper guide sleeves housed into slider tubes, the other two are in the lower side of the slider tubes. I have also make a 5 mm threaded holes in the lower side of each slider tubes to allow to empty the oil of the dumper cartridges without dismantling the fork.