I had a very small leak in my liner about just under the water line. Over time it created a 4inch diameter hole (rusted) in the wall. The liner is now concaveed and being sucked into the large rusty hole. Can I repair the wall bey draining the pool, drill holes in the wall and bolt a small sheet of stainless steel to the wall. Kind of like howw the skimmer wall is, (stainless steel)?

You can slide in a sheet of galvanized sheet metal between the liner and the pool. You must detach the cap to free up the liner so you can pull the liner well into the pool. A little epoxy and the weight of the water will hold the sheet metal in place. Trim off corners into a small arc and file all edges smooth