same tool i use every week to put pistons in many years ago i ran a flap wheel in side my bands then wet sanded them with Wd40 to get the hi spots off the in side of the band .were they stamp the band size on the outside it was pulling steel down on the inside . after boring i break the edge with the boring cutter or a drum sander made for the job or by hand which way i do it has alot to do with how big the bore is to size of the fire ring is on the head gasket i use on the job. breaking the edge helps get the pistons down the hole and make sure there is no sharp edge at the bottom of the bore is this cut the piston skrits up so i sand the bottom edge of the bores as well after a bore and hone . .018 is the lest to use 016 is the lest for 2 ring .oil rails end gap can be very big 040+ as for getting one piston small out of a set i seen more then one its not hard to see 4 out of 8 that are under 001 that why i never bore and hone a block till pistons are in hand . i allways number the pistons for bores and bore the block to each pistons real size i hold less then .0002.5 and i allways check and fit the ring gap