My friend teased me to retrofit a headlight on my old bicycle, so I accepted the challenge. After spending few bucks on small soldering iron, custom switch and a new ultrabright LED flashlight, I started to work on it. First, dismantling the whole thing, picking out a bulb and other small items included in the former dynamo light.
Then I took a battery holder from a small flashlight, combining it, gluing a custom switch to the opening where the dynamo wires were running through and a bit of soldering, putting it all together with a LED light circuit board. Trying to fit it all inside and all set, new bicycle headlight ready. Ultrabright front bike light retrofitted to the former dynamo front light.
Inspiration also from the Bicycle Safari blog.