Ball tube mills rectification works comprising of screw conveyor conditioning, replacement of tie rods, seal air gaskets, bearings etc., & External works, Replacement/Overhaul of defective Reducer gear boxes, Lub oil pumps, coolers etc., checking of backlash in drive group including alignment if necessary and changing of grease in HS, LS coupling & pinion bearings in Units-5 and 6 as and when required during the year 2020-21.