One other way to make it cut on one side is to leave the lathe in the standard set-up and advance the tool 1 unit toward or away from from the chuck and 2 units into the part. This advances the tool at a 26.5 degree angle. You can use any base unit you want. I decrease the base unit as I get deeper. Make sure you always move the same direction on each cut and advance the tool into the part as the second part. Paul M