My original equipment controller on my Giant Lafree Sport fried while riding in a surprise pop up rainshower. I have exhausted all my known resources trying to find a replacement controller from Giant, Giant dealers or other third parties. I have been told that a suitable option is to get a sensorless controller that would bypass the torque sensor system in the bike and deliver assist instead of through the pedals completely via throttle. A possible supplier suggested to me was Tongxin. I googled them and found them to be a Chinese firm, sent them an email, but have received no reply. I am told there are model airplane companies that also produce these sensorless controllers and that they would be better than the Tongxin product, though more costly. True? The Giant Lafree Sport for which this controller is needed has a 24 volt brushed motor: 400 watts continuous, 1,000 watts peak. My thanks in advance for help in guiding me to the right source for the correct sensorless controller I evidently need to get my bike back up and running.