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by https://www.flickr.com/photos/151015574@N06/, on Flickr
The first one I found on the floor after bleeding the brakes. Then I found another tonight after pulling a wheel off again to work on the suspension. It seemed to fall from the hub area but I can't be sure. They both look brand new, and the only brand new thing I put on recently are wheels (that have only been driven about 30 ft). I'm guessing they aren't important but am curious nonetheless.
edit: no idea why two photos pop up either when I only pasted in 1 link. weird