Tested the newly convexed edge with an apex @ ~22.5 degrees inclusive on an old piece of beechwood cutting board.Got quite a bit of microchipping at the very apex but no rippling.The steel might indeed be D2 with an estimated hardness at or slightly above 60 HRC.Removed all damage by filing the edge flat with a small diamond file, then resharpened to a new apex angle between 22,5 and 25 degrees inclusive.Still have to do some new testing on the same wood.
A little late to read the post, and am sorry to hear about the total ripoff. That's total fraud and it does suck not to be able to get the refund.On the other hand, gonna praise you for the creativity and the great mod, and 22.5-25 inclusive?! That's really acute! Will the edge be able to stand real world application?