Just go slow and sneak up on the final diameter you want. I'm sure I've built hundreds of engines with knurled pistons, back in the days when mechanics actually fixed things instead of just swapping parts! There are even spring steel "expanders" still available to cut down on piston slap on the old cast iron 216 pistons. I've got a couple of sets of them stashed away somewhere.
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!