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the original MDR i think is gone(out of buisness) if not let me know. i have two one very old and one master when they were last made. i know theres a fellow in california making and sell a machine as a MDR. send me a picture of your dop– the grove and its alignment with the V dop for emerald cuts and it might be possible i can make what you want. need measurements. i’m NOT pricey. regular 1/4″ by 2″ are not a problem and i make them in aluminum and brass.