Wow! Thanks for sharing that!
There goes someone that knows their way around machining stuff!
Construction was flawless. The only critic I'd have is about the polishing; it might leave a residue on the flat surface, which could interfere with the heat transfer. Someone recently reported that they "baked" their block, until this deposit just boiled off. I wouldn't recomend that, because the heat might end up warping the block. Instead, I'd use what Bill suggested to clean a block: xylene (or any solvent that's capable of cutting through wax-like substances).
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