As it happens ... in case anyone likes to watch.
This is a previous repair to the block area of the lower bout
However, cracks have developed along one side and i don't like the previous repair or the nail holes so I'm removing the old repair and replacing with new wood.
I've removed all but the last 2mm of the top wood and tapered the edges inwards so that the patch fits tightly and the repair edge doesn't align with any grain. I've lost a bit of the very brittle purfling near the saddle but this was falling away anyway.
That's the patch glued in. Still has to be planed flat.
There was a similar problem up the top end. 2" nails through the top had made a nasty mess and a fair bit of wood had come away when removing the top from the block. And a previous repair. You can see my first exploratory gouge to see whether I could do an inlay patch, but nup. Had to go further to make sure the repair was sound.
I had to remove only enough spruce till I got to reasonably sound wood. I filled the nail holes with sawdust and hide glue from the back; i'll do a better repair from the front, later.
here's the patch glued in, waiting to be trimmed back.
