I watched with interest as I am going to use this resin on some upcoming projects of my own. Thanks for the warning on using the household oven. I surely don't need to give my wife any more grief!
I certainly do not want to sound like that self-proclaimed safety guru (God forbid), however, it seems to me that I would not want to harden a mallet head like this. I'm far from a physics expert, but that energy is going to go somewhere and the only remaining options are the project being worked, the chisel being hammered, or the worker holding the mallet. It may not seem like a lot, but after thousands of strikes it will add up on increased wear on the more expensive chisel and if it's the user receiving that energy it could add up exponentially in a more rapid onset of osteoarthritis.