Kilocharlie - I see a metalurical problem with knurling. Any material(unlees you heat treat afterwards) that is soft enough to knurl, may nothold up to abuse.
I believe that Ohmstead(?) built three knifes ,on seperate ways, that where driven into the cylinders at the proper angles to cut the interecting pyramid at the bottom of the cell.
Oh, and I was wrong, it is "Cassville". on the Mississippi, SE wisc. just southof where the Wisconsin river joins at Prarrie Du Chien.