I gave up on the treble clef and cut out a small square piece of ply wood, at first I didn't like this as it had lots of layers, I gave it a ridge and painted it white to make it more interesting.
Then from the same big piece of ply wood I cut out 2 tiny rectangles on the fret saw and painted them pink, I took a lot of layers to make sure it was opaque. I then stuck these to the base.