Making a hinged hollow ball

After seeing a very nice hinged ball containing a natural pearl, I thought I would try it.  It was easy making a hemispherical ball from rolled copper wire; 1.6mm copper wire was rolled to 1.8×1.0mm.  Three lengths of 30mm were sawn from this. Two were given a 45° chamfer at each end then soldered at one end.  The trident was then shaped round a 16mm dome and domed in a 19mm dome.  This was repeated with a second set of three strips to give two half-cages.  Each soldered triplet was soldered at the other end then again domed, but in a 20mm dome with an 18mm punch.  The cages looked very attractive, but the hard part is to try to find a way to hinge them neatly.  I subsequently soldered a small copper rectangle, about 4x5x1mm, to one end of one triplet.  This however proved not thick enough for drilling for a hinge.

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