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@Ordinata
Of course, while hard wiring is logical, wireless (Radio/Bluetooth/IR) is the ultimate answer.
*Basically the tech in micro helicopters which has been around for a while now. (Prob in development already tbh)
imagines tour saboteurs jamming derailleur frequencies
I have an old non cycle related project with this exact technology. A linear scale controlled via radio. Just too bulky atm. /csb