I've found lots of Palnuts in the bottom of oil pans, buried in a layer of sludge. They were notorious for coming unglued- - - -which makes me wonder how effective they were at keeping rod nuts tight. They were also used on MOPAR engines- - - -which were all equipped with insert bearings. Even a slight overtorque of that sheet metal nut would strip it and make it prone to come off.
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!