John Grimsmo's knifemaking business has a Kern which is perfectly capable of doing the tolerances needed behind the apex. That's a very expensive CNC machine, but it's capable of precision & accuracy well beyond what's possible to achieve by hand.
https://grimsmoknives.com/products/norseman-8359-8730526 look at those steps, calling this "precision & accuracy well beyond what's possible to achieve by hand" has to be a joke. Their other non CNC knives look much cleaner.
