They make an adj hand reamer and that is what you should use to creep up on the finnished size. 17MM is "around" the finnished size (11/16 to the rest of us). The reamer I have expands with a turn of a screw on the bottom, give it a little twist and it pushes the blades out, always sneak up on sizeing as its hard to put material back in. If you feel that the constant R & I will beat up the KP's, just machine up a dummy set a .0005 (or till they fit)smaller