I am listening to the archives (too busy on Sundays) from 10/02/2005. They wanted to know how to put a cup holder on a lawnmower.
http://www.stukcup.com/ is what I use for my tractor and mower. Downside is it is a water bottle rather than cup. Upside is it is insulated and able to hold on even over bumpy ground where a cup would spill.
