There is a bolt on each end of the plate. Remove the bolts, then the plate will come out - there is a nylon/delrin bushing, but it slides out with the plate. Turn the plate over, align everything, and put a drop of Locktite blue on the bolt threads. Re-install the bolts, but don't overtighten. You also may need to change out the center bolt that connects the bracket to the motor tiller arm. Sometimes the 5358 bolt is too long for a 5345 setup.
Good luck - see ya on the water!