I also have my own method of rewinding DVDs. Gently scrape off the data layer(s) with a razor, and mix the data flakes in a bowl with some epoxy. Stir vigorously in a counter-clockwise direction. This will produce a silvery paste. Using a spatula, apply the paste to the opposite side of the DVD disc. Voila! This has the added bonus of defeating all forms of DVD encryption technology.