I'm planning on installing a piece of heavy wall steel tubing across the hole, brazed or tack welded into place- - - - -probably a cut-off piece of small block Chevy pushrod.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!