I have a bass with irregularly sized bore holes. I also have some tuning machines that fit 11/16" bore holes. So my plan is to enlarge the existing holes, but I want to make sure it goes as smoothly as possible. I have a drill press, but I want to make sure I use an effective process. I was thinking of using a step bit to increase the size to 11/16" from the back of the headstock and then increase the entire size of the hole to 11/16" with an 11/16" spade bit. My question is, will this strategy work? Is this the most effective method of going about increasing the size? Alternative strategies that would work better/be safer. I want to avoid damaging the neck as much as possible. Any advice is much appreciated.