I don't know if you were thinking of one method or more, but I just realized there are 2 methods I've seen. One where the whole exhaust nozzle is gimballed, which seems difficult to make. The other would be to have directional vanes in the exhaust flow, which seems easier. I've seen a Banana-Hobbies F-15 someone had (For a little while...) with the nozzle vectoring, and the Phase3 Squall, I believe, had/has an optional kit with the vanes.
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