Had one of these keychain flashlights zip tied to the shaft just below the head unit so I could flick it on and off with the back of a finger if the headlamp wasn't needed. It would loosen occasionally and last outing it fell off completely. So 3d printed a semi-flexible mount, now all is tightly held by zip ties and the light easily swapped out. It's just a little bit of light at the coil but is a nice convenience to have with a touch of a finger.
