I have a Basta ellipsoid halogen dynamo which suddenly stopped producing light. Naturally, I suspect the bulb has burned out. However, I cannot seem to open up the casing so I can get to the bulb. There is a little icon on the casing which implies "push and twist", but I cannot make it work. Is there some trick I am missing?
I was also trying to force it when it was mounted on the bike, with no luck. It turns out that you have to unscrew the housing from the bicycle, and then you can twist the casing and open the lamp to replace the bulb. Very easy to do.