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That dates it to no earlier than 2001, and it still uses tables. But I learned how to open whole tube of JB Weld and how to center a sanding mandrel.
I see this as a down-sized
D-port head. Granted, there are advantages to 4-valve heads.
Homebrew extrude honing shouldn't be rocket science, just some machine tooling of a jig and correct selection of the media. I think it was two ingredients, like aluminum oxide particles in a matrix.