Here is a cello neck that was sheared off. Since it was an inexpensive cello with centimental value, I repaired it without doing a neck graft. Here are some work in progress pictures.
I fix a lot of cello necks but usually don't take any photos because it's fairly straight forward. Here is on where it was broken at quite an angle.
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Tip for measuring a neck to make sure it's in the center.
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Here is a another cello with a broken next. I have fixed hundreds of these. Three screwed pins at the correct angle and lenght works the best. Also clamping so that you are not fighting gravity makes things a lot easier. Once the end grain has been flattened to match the fingerboard, it's dyed black and sealed.