Ball tube mills rectification works comprising of fabrication and welding of screw conveyor ribbons, screw conveyor body liners etc., replacement of Tie rods, seal air gaskets, bearings etc., Overhauling of lube oil pumps and coolers, their replacement and checking of backlash between Girth gear and pinion including alignment in units- 5 & 6 as and when required during the year 2019- 20.