That's kind of a bummer. Some folks have crafted their own riving knives out of thin kerf blade stock or sheet steel. There's also the option of returning the WWII and picking up an $18 Delta 35-7657 (0.118" kerf)....almost full kerf, but not quite. I can't say that it's the equal of a WWII, but it's surprisingly close for a fraction of the cost.I did measure them and the kerf is right at 3/32 or .9375. The riving knife says minimum blade kerf is 3mm or .118. The knife is bigger than the blade and as such, pinches the cut against the fence. The knife forces the kerf to widen in order to finish the cut. I have seen thin kerf knives for other saws, I just hoped someone would know whether there is an aftermarket that works or if another company's knife is compatible. I've even seen a thin kerf knife for the Jet Xacta but don't know if this will fit my ProShop.