When my generating unit went down with mechanical problems, I was often out there doing my part getting the unit back on line. Big $$$$$ being lost, especially if we were laying off power on the open market. Like knowing where a metric oil line fitting on a German designed fan might be. Only had to have that bite me in the rear once. From then on, I knew where two reposed. One in the warehouse(maybe) and one in my cubicle locker(most definitely).