Deepak Rathore (b March 24, 1980) of Rohtak, Haryana made the smallest buttermilk spinner (madhani), 30 mm high and 8 mm wide, in two days spending 5 hr a day. He displayed it at Shivalik Sr Sec School, Rohtak on May 2, 2015. It operates on 3v DC supply and contains a vibrator motor, copper strip, madhani blade and round washer.