I want to change the transmission oil myslef for my 2000 ML 320. I followed the DIY article at http://www.peachparts.com/Wikka/Trans7226Fluid but stuck at the step to roate the crankshaft pulley to drain the torque converter because I could not find a nut in the middle of the crankshaft pulley to rotate. I must have missed something because the pulley has to be bolted to the engine somehow. I also looked up the DYI site at http://www.whnet.com/4x4/shoptalk.html but still no hint there. Any suggestion?