The machinists who know how to do it like me are a dying breed. The procedure isn't difficult at all- - - -set up the piston in a 4-jaw chuck and roll the skirts past the knurling tool by hand until the diameter increases as much as you want. I run 3 or 4 knurl passes about 3/8" apart. I can usually expand a piston skirt up to around .005" maximum. .003" is more normal, as I can take out a lot of cylinder taper with that dimension. Honing a cylinder over .005" is getting into "rebore" territory. Rings in a straight cylinder will last several times as long as ones that must expand and contract 60 times per second at 2K RPM to stay in contact with the cylinder walls.
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!