I don't believe it's a lack of RandD Redpower, but rather economic forces that prevent Case from actually fixing the problem. If they were to actually fix the problem at the factory, then Case would sell less replacement sieves, and their dealers would have less work to do. I don't have a clue how many combines make it past their first year without cracking the sieves, but I would bet that it's the majority of the machines made. As long as Case doesn't have to pay to fix these machines, I'm sure they don't care. Until the cost to fix broken machines that are under warrenty becomes prohibitive, I don't think Case will fix the problem. Just my $.02.