If you’re not using the hole, you could just cut a plate a little larger than the oval hole, and pop rivet it in place. You could use a little RTV between the plate and floor to seal it.
Even better. I still have the stomp starter. It may work. IDK. But I`ll put it on the shelf. That way someone ,one day could reverse it back.
~ BD. "You won't find me in an old folks home" Pioneer Florida Cracker 1958 Apache Stepside 1958 Apache 1/2 ton Panel 1959 Apache 1/2 ton Panel