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I'm guessing you already got the mag catch out? If so, then remove the right grip panel. Remove the trigger bar spring. You'll see the support plate has a little nub right in the middle. I take the sig armorer's tool (or a flathead screwdriver) and push on the nub rearward. It will slide back and out of the groove it's in. Try and keep the screwdriver inline with the pistol as much as possible. It usually slides out relatively easily. The metal here is very thin and you don't want any force exerted outward. You only want force rearward.
Insert in the opposite direction.
Insert in the opposite direction.
