Here's a DYI how-to video: http://www.youtube.com/watch?v=p0g4CWORBQU
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Alternatively, this may work too. Remove the original (broken) lens cover, and affix this to the outer shell: http://www.amazon.com/Cell-Phone-Camera-Lens-Protector/dp/B004GZSXQI/ref=sr_1_1?ie=UTF8&qid=1314128078&sr=8-1