Replacing a A-frame Jack, need to enlarge 2" hole to 2-1/4"

trailmanor, I like your idea of cutting little slots all around and then bending the uncut pieces to enlarge the hole. It's not elegant, but it gets the job done. When you are done, you can clean up the little spikes and shards with a round metal rasp.

And then if the raggedy edges of the hole are still visible after you install the new jack, slap on some caulking around the perimeter to hide the mess. ;)