Once the time necessary for gluing the linings has elapsed, the various clamps are loosened and the process goes on by levelling the part of the ribs that will be glued to the back with a pad and sandpaper. The back, usually made from the same wood of the ribs, can be peeled or radial for the whole bottom or, as in this cello, in two pieces joined in the middle.
I continue the work by positioning the shape of the ribs on the back piece and by drawing the outline of it with a pencil, using a tool I built, then finally I cut the piece out with a narrow blade.