For you warty. After a quick scan in the archives, Berkley's tools to go along with the Dui Chirra were tweezers, awl, saw and buttonhook in addition to the karda and chakma. The Dui Chirra model is patterned after an older khuk that Berk either supplied for HI to copy or they used a model that he made. The YCS was made from a model that Yvsa made in which he incorporated elements of different models that he felt would make for a good khukuri.