If the cup end of the pushrod is failing, inspect the ball at the end of the adjusting screw. If there's a nipple-shaped wear pattern in the center of the ball, the leverage on the cup as the rocker arm moves is the problem. replace the adjuster screws.
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!