The edges of the top on this bass are worn or broken off in four spots.  I plane some of the wood off the inside of the top and add new spruce to the under side, with the grain tilted slightly to strengthen the edge.  Spruce matching the grain is inlaid on the top edge after the top is re-glued to the ribs

Here is the inside of the top.  The right photo shows some new edging being glued on.  The left shows all of the new edging, the bottom half carved to fit the ribs.  I add the top overlay and shape all the outside after the top is back on.

Before the overlay.

After the overlay is glued & carved.

After varnishing.

The new top edges are carved down and varnished to match the top.

While the top is off, I also do all the back and rib repairs.