A double pedal looks like super strong black with two points in size: 1) a single attachment to hold the axis of the second pedal ... it is necessary to tighten a death which ends round this axis. Overall, I do not remove it. not practical for storage. 2) for spare parts be ordered if necessary, do not bother to count. otherwise, it is easy to regulating and fairly precise. a remake, I will take a double iron cobra style and all spare parts are available. after sales doubled and fasteners.