The only sure fix is to swap pistons. We used to run a knurl on the skirt area to decrease the clearance a little, but recently the cost of parts has gone down and labor has gone up so it's impractical to patch on anything- - -just install new parts once the engine is torn down. Modern hypereutectic alloy pistons work with spooky close tolerances (.001"-.002") since there's virtually no heat expansion.
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!