A spreader disk assembly (28) for spreading crop residue such as straw discharged from an agricultural harvesting machine (20), and more particularly, which has a bat support mechanism (50) that enables the bats (44) to be quickly and easily hingedly or pivotally convertible from a deployed spreading mode to a flattened stowed mode for windrowing, which does not require removal of the bats (44), or the disk (36) from the spreader. A locking mechanism (60) is provided that enables the quick and easy conversion and securely holds the bats (44) in both modes.
