To maximally stabilize the Newell posts I am constructing for the River House, I decided to channel them through the end of the stair tread before fastening them to the floor. This adds a considerable amount of strength at the expense of a rather complicated mating joint with multiple critical dimensional tolerances. Machining these was possibly the most stressful work I have done on the house thus far The slightest mistake on either part would have resulted in a depressingly large amount of rework. I perfected my approach on scrap material before attempting the work on the final components and thankfully this led to a successful outcome.