When fitting a small piece of wood like this, it’s important to be able to keep it in exactly the same position each time when chalk-fitting it against the original.
In this case, I used 2 flat surfaces created by the dental compound backing I normally use when gluing a neckgraft and a small stud superglued against it.
Iris Carr Restorations 
As always, beautiful work, Dr. Carr!
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