Finger print on the lens...
This is a very cool DIY BTW! Wouldn't mind doing something like this for my car someday! I have a few GoPro's, but they stand out like sore thumbs, and are not really geared for this kind of permanent application.
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BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03
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