In my initial CP, I screwed up drilling a button hole and had it 1/4 " too far south. I plugged it with some scrap wood and wood glue, then let it completely dry. After filling with "plastic wood" and sanding it smooth, you couldn't tell it was there. I then redrilled and it is still quite solid. (Of course, I wound up scrapping the entire CP and started over from scratch, but now I have a nice test panel to work with).