Whilst iw as looking for a schematic, googling shimano motor exploded image brings up a lot of diagrams of their fishing reels (Shimano are big into fishing rods too!) Looking at some of them i wonder if the Steps has much in common with some of their reel tech! I know the Brose motor shares a lot of its tech with a lorry windscreen wiper motor, but maybe we are riding glorified fishing rods!