The Case of the Slumping Polystyrene Foam (Question for the Experts)

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HerpDerp Is that the way it is? Makin' stuff and breakin' stuff Mucking About With Things Questions for the Experts The Diary of Lupin Pooter
Recently, I mounted a few pairs of metal chests of drawers piggyback-style, which entailed drilling some holes. To keep the point of my drill from skittering away, I used a center punch to create a tiny dimple at each of the intended hole locations. Intending to clean the drill and the deburring tool that I’d used on the holes (a hex-shank deburring blade in a hex-shank handle as you can see in the photos below) once I had unpacked the tool-cleaning stuff (WD-40, Fluid Film, etc.), I laid them both — along with the center punch — on a fragment of one of the polystyrene foam sheets in which the metal drawers had been packed for shipment.