So I'm guessing tool steel is very very solid if so how the hell do they carve out the cavity for the parts then make an identical but inverted mould for the other. I'm scratching my head... And even in china that kind of work would be damn damn expensive wouldn't be to many people offering that service
Next time I visit the place I'll get some videos - the steel is cut using a super fine wire that must be made from 'God knows what' and it "saws" through the steel like butter - amazing to watch.
