im in the procces of replacing my alternator,i have managed to loosen up the 12mm threaded rod that runs down to the belt tensioner,but im also aware there is a bolt that runs thru the center of the tensioner,someone told me it was 20mm,i found that 15mm fit it ok,im having a hard time trying to loosen the belt,see there is a protective metal half sleeve that covers the outer edge of the bolt,and i have large fingers,is there a special tool i can get to loosen up the tensioner,its icy cold and ive been working in the snow on the cold ground,id like to speed things up a bit if possible,thanks guys.marc