That precision chisel-and-hammer method looks like a fine thing to discover, maybe, uh, 76 years later.
I believe the current Ridgid-brand spiral pipe-reamer instructions mention using it for KO upsizing. The MegaSlugSlammer KO punches are nice, but believe me, in their day ball-bearing drive screws and then the 2-handle ratchet driver were great improvements too.
