Product review (5 stars): Old dishwasher is good as new now!
Old detergent dispenser cover was popping off the hinge pin and after putting it back on a couple times the little spring had become deformed and was barely able to open the cover anymore.  I installed new cover and spring, but kept the old metal hinge pin which is much sturdier than the plastic pin that comes in this set.  I didn't install the latch from this kit because my old one still works.

It's really easy to mess up the spring if you don't put it in just right.  The trick to installing the spring is to put the hinge pin through one side only and put the spring in the middle of the pin.  Have the square middle section of the spring facing downward and pop one side of the lid on the pin.  The tips at the ends of the spring should be inside the bottom lip of the cover.  Before sliding the pin into place and snapping the other side of the lid onto the pin carefully - very carefully - pull the square middle section toward the molded place it is supposed to go.  Then push the pin into place and snap the other side of the cover into place.  I hope this awkward description of an awkward process helps someone.