A rotary milking platform has:a) a deck 1 suitable for supporting cows for milking；b) an beam 2 arranged to support the deck 1； andc) a plurality of rollers 4 arranged to take at least a substantial amount of the weight of the beam 2 as it moves in a generally rotary fashion；characterised in that each roller 4 is adapted to automatically orient itself to distribute the weight of the beam 2 generally evenly over the roller 4 to avoid or substantially reduce point loading between the beam 2 and the roller 4 in the event that a least part of the beam 2 is not level.
