In case the auto translation goes berserk, the wood he's using is box (salvaged from a friend whose box hedges were being ravaged by a parasite) and ebony (given to him by a friend who had it growing in his garden in the Cameroon!)
Serious question (for those who make it to 11 minutes: why does he heat the stem of the metal insert to red-hot before shoving it into the hole he's just drilled in the handle? Would that not tend to leave it a bit loose when the metal cooled down?