Hey Danny, Sometimes the lines that are just the width of the blade are there just to add a little detail. These lines are called veins, or veining. Sometimes they define a shape like an ear or nose. To make these cuts you need a drill bit as small as the thickness of the blade, unless they existent from a larger cut. The small drill bits are usually sized by numbers, such as 61, 62, and so on to 71. These bits are available from Mike at Mikes Workshop and Sloan's Woodshop.