centre notch for neck alignment (?)

[Guido]

Not all but some makers of the Kloz family have what seems to be a centre notch in the far side pegbox wall. See first photo.

I always thought this had to do with some method of neck alignment during construction... anyone know details?

Likewise, Degani's hollow fingerboard (and nut) allowing to peer though (or insert a rod)... anyone know what he actually did there?

And finally, the second picture, a notch in a place I have never seen before. Maybe it's just damage, maybe it's intentional. Anyone seen that before?

[Brad Dorsey]

11 hours ago, Guido said:

...a notch in a place I have never seen before. Maybe it's just damage, maybe it's intentional. Anyone seen that before?

I don't recall seeing one like that before.  I think it must be intentional because it looks original, and because it's too precisely aligned with the central ridge to be accidental.

[Blank face]

17 hours ago, Guido said:

Not all but some makers of the Kloz family have what seems to be a centre notch in the far side pegbox wall. See first photo.

I always thought this had to do with some method of neck alignment during construction... anyone know details?

Likewise, Degani's hollow fingerboard (and nut) allowing to peer though (or insert a rod)... anyone know what he actually did there?

And finally, the second picture, a notch in a place I have never seen before. Maybe it's just damage, maybe it's intentional. Anyone seen that before?

These three notches in the pegbox north are described as a feature established by Georg II Kloz, and adapted by his pupils, f.e. Aegidius and members of the Hornsteiner family. I would see it related to the Chapelle at some Vieux Paris and a few other makers (S.Serafin).

I also remember having see a similar notch at the end of rear of the pegbox at a Hornsteiner violin, but have no idea about the purpose.