"Big knife" for luthiery?
I just saw a YouTube video of Pablo Requena carving the heel on a classical guitar neck, and at one point he used a knife that I'd never seen before. It had a long handle - long enough to use with two hands, and a fairly long blade, but the edge of the blade was relatively short. He could get into really tight places with it, and the long handle and non-cutting part of the blade gave really good control.
I tried to find it, and did find some references to a "big knife" used by Mexican luthiers. I got the sense that most people make their own.
Does anyone use a knife like this? How is it sharpened? (looked like a chisel grind, kind of like a drawknife.) Has anyone made one?
Saw some pointers to places that sell luthiery knives of various kinds, but none of them really looked like the one he was using. I tried to include a screenshot of him using the knife, but kept running into an error. The link to the YouTube video is here: http://youtu.be/5gzanQcRMGM