A grafting knife must be sharper than sharp. In Episode 84, Łukasz shows step by step how to sharpen a grafting knife to an extreme level – sharp enough to cut a hair in the air. He explains the importance of maintaining a perfectly flat bevel, working progressively through different grits, and finishing the blade for a razor-like edge. Precision is everything when it comes to grafting. A clean, effortless cut increases the chances of success and protects delicate tissues. At the end of the episode, Mario summarizes the entire 3-part sharpening series, highlighting the key lessons about tool care, precision, and respect for craftsmanship in bonsai. A strong finish to this practical and essential series.