It takes a few minutes to build and I imagine you can substitute materials easily.
- A food sealer clip, you know the big plastic ones
- A tripod mount piece from a webcam (if not 1/4 inch coarse thread nut is what you need
- Sugru, though hot glue would do the job
- An elastic band
Oh and this time I used a dab of hair gel on my fingers to stop the sugru sticking to my fingers, didn't work as well as moisturizer does, so use that or soapy water. Also when you're doing DIY, always wash your hands before going to the toilet, it wasn't as bad as the time I was painting the shed but it's never a good thing...
Step 1: Cut the Plastic
I also had to cut the thin strip from the middle of the plastic channel, it's worth noting that the size and shape of these should make them hold most smartphones pretty nicely, the iPhone 4 fits well as does my Xperia X10...