The Prather chart only addresses the surface of the cue. Inlays are put into the cue so the actual measurement you need to start with is the diameter of the cue at the bottom of the inlays. Example. The finished size butt is 1.200" where you want your row of inlays. Lets say you plan to put them in .125" deep. Subtract double that number from 1.200" and you have the diameter of the cue at the bottom of the inlays. Which is .950". Now start with that number and use the Prather formula and you will know if you have the room to put them in without having to modify the bottom edges of the inlay parts.