Sorry for late reply Richard but I didnt have any photos so I went out today to get some.
You are right, the routed part is the back side but there is no need for a mirror part.
In this case I will use a form with a 32 mm hole and 3 mm rad. Suitable holesaw for this is 25 mm.
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Center the die using the plug by either eye-balling it or use the holesaw
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There are several ways to work with the die.
One way is to use a "base ball bat" mallet but then the die has to be clamped to the workpiece to prevent movement
Place the mallet in the hole and hit it with another mallet. This will avoid getting tooling marks and denting he metal.
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If needed to get the edges to contact fully, place a round stock and hit it as my finger points.
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Here is the result
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This can be time consuming and difficult so if you have a press and a steel ball that's much easier
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A few made
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