Suppose you have a device with a worn-out rubber button, such as the flashlight pictured here. With a little Sugru and patience, your device can be working good as new. Just remove the old rubber piece from the device and form a small amount of Sugru into the same shape as the old one. Make sure the Sugru is formed thin enough to flex easily once it sets. I made the mistake of making my button too thick so it is hard to actuate the device. Here you can see my flashlight with the old button on the left and the new Sugru button on the right.