Experience with burnishing lifter bores?

How much was it. You have me thinking now. When I tube a block I have to peen the tubing so the lifter will go in. Even after I peen it I have to gently relieve and high spots with a carbide burr. Now you have me wondering if I could use this tool. Hmmmm
I still had to hit the copper tube with a sand roll, but it didn't take much.