What can castellations do for you?
Castellations are a low cost connection method that turns the PCB into a surface mount sub-assembly. They are commonly used on small radio assemblies and as breakout boards for fine pitch SMD components. This first attempt has proved very informative. As can be seen, a section of the plated through hole remains, likely the result of a dull end mill. Images shown are of 200x and 20x magnification respectively… krazatchu