Product review (5 stars): NO MORE STOPPER LEAK!
I recently installed a new and expensive Delta disposer flange with my new sink but was very disappointed to find that the stopper was way too small to plug the sink.  I saw this item and was curious as it installs from the top.  I put it in and it "snapped" right in place.  Note that I left the original gasket/baffle, installed underneath to the top of the disposer, in place as is.  My stopper now fits snug and its great.  Easy fix!