I don’t think there is a problem with the WC crank. I don’t know for sure but by looking at those pictures, I would bet the manufacturer of that aftermarket clutch, 1[SUP]st[/SUP] never used all the spline area available on the crank, 2[SUP]nd[/SUP]they most likely never made the clutch splines fit the crank spines tight enough 3ird The clutch was most likely made harder than the original crank, the clutch should have been made softer than the WC crank, so if there was a failure it would have been the less catastrophic part, the clutch . If the aftermarket cutch was looser and harder than it should have been it would cut those crank spines off like butter. Logic is on the side of my theory; because one crank has failed—and it’s the one with the aftermarket clutch not one of the hundreds of wildcats with the factory clutch. I to design and make new parts for a living— Ihave retrofitted hundreds of OEM parts over the years, Not side by side parts or car parts but industrial parts, I have had plenty of early failures when first introducing a change in a part, this is part of it, but I always make the customer aware it’s very possible to happen until the prototyping is done. I have warranted a lot of prototype parts. I am not judging the producer of this clutch for a failure before his part has ran enough units to be perfected but he needs to take the hit for this not AC.