I'm running my dynohub with a shimano switch/current limiter which appears to be goosed (switches on and off intermittently, whether it is actually switched off or not!).
It seems a replacement is unavailable. Are limiters now integral with headlights?
I was also thinking of wiring up a capacitor for standlight at the back, but am guessing that any DIY attempt will not work as well as the commercially avaliable ones?