Lift off the black button on the shifter (tight, spring clip fit). Use an allen wrench to loosen the set screw, remove the T handle. Plate will lift free.
I was afraid you were going to say that. I've replaced the original because the snap clips were broken. I'm wondering if removing the replacement will snap the clips also.
Dilemma time
Say hello to my leetle friend..Presenting the "FIRETOAD"