The Sensex at the Bombay Stock exchange fell by 127 to trade at 20,761 in afternoon trade today. The fall was due to the selling pressure in capital goods, metal and power counters coupled with lower Asian shares and overnight decline in US stocks. The 30-share index had declined by 104 points in its previous session. The wide-based National Stock Exchange index Nifty moved down by 40 points to 6,180 a short while ago