How do you put on new keyway on riding mower?

To put a new keyway on a riding mower, first, ensure the mower is turned off and the spark plug is disconnected for safety. Remove the drive pulley or the part that houses the old keyway, and clean the area thoroughly. Insert the new keyway into the slot on the shaft, align it properly, and reassemble the components, making sure everything is secured. Finally, reconnect the spark plug and test the mower to ensure it operates smoothly.