I might have mentioned this before - my Dad used to "fix" rust holes by buying bondo and paint and making sure the clerk put them in a paper bag. Still in the parking lot, Dad would mix the bondo and smear it on the hole using the paper bag. Rattle-rattle, spray-spray, and we're good to go.

Kinda similar, Dad was selling a car that had a weird vibration in the engine. It turns out one of the four fan blades had broken off and the imbalance was the problem. Dad broke off the opposite blade and it ran like a top.

Forgive me my nonsense, as I also forgive the nonsense of those that think they talk sense.
Robert Frost