Check out the “Let it Snow” Xmas 2020 Group youtube project!”
The fracture of the button area from the main portion of the back plate is a difficult repair. This area takes the tension of the strings from the neck (multiplied by the moment arm of the neck joint depth) and transfers it to the back plate.
The strength of the wood in the area separating the button from the main portion of the back plate is weakened by a purfling groove. So why not eliminate the groove in this area? Some luthier of old did this. I salute him.
Without deviation from the norm, progress is not possible. —Frank Zappa
The future is already here—it’s just not very evenly distributed. —William Gibson