Hi, if you counter bore on both sides why is the finish on the under side a problem ? surely the c/bore will take care of this. If you get a spindle I think it would be much easier and you can use an end mill and program any hole size and counter you wish. Of course you will still have to turn the material over for the second c/bore. The break out on the underside could be eliminated if you use a down spiral cutter. Good luck with whatever you try. G.