Sounds promising. I miss having a rear view mirror. I hate helmet mirrors and won't use one. My current bike (Surly) has bar end shifters where I used to have a mirror on my old bike that just had conventional drop bars. I've been riding for months without a mirror and it makes me nervous sometimes.

Do you think you could attach a picture? I don't know what kind of mirror to buy. What kind of mount is it that you're adapting to the down tube?