J.T. from the U.K. submitted the first hack I have seen incorporating a film canister. He has an excellent Flickr set that gives a visual tutorial. He is rocking a Dinotte light, which I had never heard of before.
I have a tendency to go with pretty inexpensive lights, but I ride in a city filled with ambient light. If I was biking down a dark road with no lights, I can see a more pricy light being a wise investment. For the full meal deal, visit J.T.'s Flickr set. Thanks J.T.! Flickr Name Tompy
Made from some bits and bobs that were lying around and an old film canister. There's a metal seatpost shim inside the canister for extra strength. The canister lid gives enough of a ridge to prevent the Dinotte's O ring from slipping off. What you'll need to make this light/accessory mount: - an old film canister - I went to my local photolab and scrounged some - something to make the film canister more rigid - I used a spare seatpost shim that I had lying aound - a screw/nut and bolt - something to attach the mount to the the bike - mine is attached with an allen bolt to the rack mounting point - a couple of washers.