So I have a fretless 5 string neck through bass that I'm particularly attached to. But I never play fretless anymore and this bass is perfect for me other than it's lack of frets. Sometimes I wish it were fretted but I know that would be a huge pain at this point. Has anyone here slotted an unlined fretless bass at this stage in it's life? Did it work well? How did you go about it? The bass in question is built similar to an old Tobias and has a poly finish and I was hoping not to ruin the finish or change the fingerboard. I could envision this working on a CNC machine if a jig were made to hold the bass just right but I don't have a CNC machine. What do you guys think? Easy? Crazy? Expensive?