Servo needs to be hidden under the seat, so I built some bits to do just that. I also used some metal u-channel to mount the servo. All overkill of course. I also remade the pivot of the control stick. The washers I has used had an internal diameter of 3.2mm. The bolt was 3mm. Very sloppy! Same with the link at the bottom. It took some time, but now it is all slop free!