There was something deeply satisfying about watching a true craftsman doing their thing. This was artisanal beyond my reckoning. I had no good ideas myself on how you'd find and reuse the same hidden frame screw holes when repairing a cedar plank and putting a new one on--and doing it this way means the original frame isn't weakened with any new holes.
Such a very elegant use of geometry. Something tells me it's been done this way for a hundreds of years.
extra bonus: as a huge house renovation porn fan, I enjoyed hearing this version of Tom Silva's voice (the lead contractor on This Old House) ---as if you'd just met his older, saltier brother or something.