Nebari-san---- I fear that unless you are up for some blacksmithing, you're screwed. This whole business of Chinese vs. Japanese tools has been an issue for years, and the truth is that lots of Chinese tools , though attractively cheap, were utterly useless. So, I was thrilled when Tian began selling stainless Chinese tools that seemed very good--- I gave them good reviews on Amazon. Since then, one of our Clubbies who works on larger material used a Tian trunk splitter to peel dead wood, and turned it into a stainless pretzel. I still like their look and feel, but probably best used for smaller material....
As you know, these kuikiri/concaves were designed to make a cut that would heal more rapidly and attractively, but they were misused on conifers, where concave cuts should almost never be made, and for chewing on large trunk/branch cuts, which caused the kind of trouble you have now. As an analogy, my ex-wife used to buy cheap vacuum cleaners, which broke after a short time, at which point she'd buy another cheap vacuum. I always wondered why she didn't just buy one good machine that would last.............. note the "ex".......
john
of the manufacturer's stamp. So go ahead and tell me that I should have bought one made in Japan and put me out of my misery. 
