Charles, yes is the simple answer.
You will require the spring kit for the unit and then you have to open up the transmitter and remove the bar that engages with the ratchet, and then insert the spring mechanism exactly as it's set up on the other stick.
can I ask "Is this a second hand set?"
Can others advise please, is not the default to have both sticks on centering springs and change over to ratchet if required by the user?
Another question for you Charles, is the throttle on the left or right hand stick as you look at the set in use?
Kimmo