I wrote another post on my blog about how I over sanded AND then cracked my reed (that I made). It ruined the Back D. But applying some super glue brought it back.
Note that I am a beginner. This we reed #6 for me.
While I had read about fixing a crack with super glue it did not occur to me what the effects of a crack might be and how some glue might fix it.
http://uilleannpipesbeginner.wordpress.com/2013/02/26/super-glue-reed-fix-brought-back-my-back-d/