https://www.youtube.com/watch?v=SDcDmt2Or70
Link to a match where both us (226) and 217 scaled. We have a multi-stage lift made using rev-rail, and is connected to a series of constant load springs. The bottom of the mechanism is attached to a winch. At the end of the match the driver reverses the winch, allowing for the mechanism to go up, and then brings it down to scale. We used 2 cims for the scaler, and a back drive gearbox with a servo. I'm not sure about 217's scaler, but I think it uses similar tactics with a lock to firmly grip the rung.