Here is a photo of my Bickerton. I haven't ridden it in many years, but as I recall, it was very flexible and scary! Note the reinforcement bar in the photo, that, at some point, Bickerton was forced to add before the US would allow them to be imported. I don't think it would be very easy, or practical to replace the handle bars. I guess you could replace the head set but, I always understood that the bearing less plastic headset was used to add a little resistance to the steering, to make them a little less squirrely,