It appears that the 210 comes with a 12 ft work cord; can a longer cord be used; possibly a 25 ft cord? If so can one upgrade to the longer cord when purchasing, or do you need to buy a longer cord in addition to the one supplied? Same for the power cord; can one add to the length of the standard cord? If so do you purchased an "extension" or can the longer power cord be added at the time of purchase?