Product review (1 stars): I took the wheel and plug to the hardware store where we found that a 1/4" flat stainless steel washer plus a 1/2" aluminum thre
Add me to the long list of folks who think this wheel/plug design is criminally awful.  Rather than spend nearly eighty bucks replacing all our failed wheel assemblies, I took the wheel and plug to the hardware store where we found that a 1/4" flat stainless steel washer plus a 1/2" aluminum threaded post with screw are a perfect, sturdy replacement for the terrible, breakable plugs.  Just drop the washer into the center of the wheel, insert and then screw the post assembly together through where the plug used to fit, and you're set.  Total cost to replace eight wheel plugs:  less than ten dollars, and the metal fittings will likely outlast the dishwasher itself.  (Make sure you use non-rusting metals, though.)