It's been a while since I posted anything on this - life happens.
Here is the top of the violin I am restoring. This is just the biggest piece, you can see the two sides at the top (the upper bouts) are missing - I have them and they will be reattached after I finish separating this seam.
The sludge that was there is all gone and all the pieces are mostly clean and ready to start fitting them back together except this one crack in the top that I want to repair.
Here I am trying to open the glue seam of a crack that broke the top in half and someone glued back together with something. The two halves do not fit together well, and had and ugly seam and ridge. So, I am attempting to encourage the glue in the seam to let go so I can get the two parts separated and clean the edges up so they fit better, then reglue it - hope for a little better result.
To separate the seam I have a string with each end in a cup of water and the string laying along the seam. I will let this lay for about 12 hours and test the joint, if it is not ready to fall apart, I will let it go another 12 hours. If after 24 hours it still will not fall apart, I will let it dry for a few days and try again the same way but with acetone instead of water.
There is another crack that was "repaired" at the top end of the f-hole, I expect I will take that apart and redo it also. The other long crack down the center is not a clean break full length, so I am planning to try to glue it in place without taking it further apart, the inside of the other cracks look clean.