Time to deal with the details of the bridge. First, to drill through those bridge pin holes... clear through the bridge and the top and the bridge plate that is underneath it. Then the holes are tapered with a reamer (the pins are tapered). Then the tops of the holes are chamfered so the pins seat well in them. And finally, a notch is cut with a little saw and file so that when the string is seated in there, it pulls against the bridge plate and the pin is seated fully in the pin hole.