Our friend Chris over at Problem Solvers sent along a great little hack that was posted on their web site. The page link is here, and below is the text and picture. Thanks Chris!
My friend and DIY overlord Anthony sent me over some pics of his solution for mounting the front of his fender. The bike frame didn't have a chainstay bridge, so he improvised with a tube, zip ties, and presta valve nut. Check it out: