Thanks guys!
Ryan, the plugs and splines are all rounded on the edges.
Ebony plugs are a pain, but I've made a number of jigs and tools to crank them out faster. They need to go to 1500 grit and McGuires #7 to get rid of the scratches and get the "look".
Since the plugs are either 3/8" or 1/4" square, I make some sized square sticks that I then round over the ends and cut them to length.
T'would be easy on a lathe (the rounding) but since I don't have one, I searched long for a 4-jaw chuck that would fit my drill press. They go pretty fast that way, but still "ugh"!