Firstly, a template had to be created out of two equal female pieces by a CNC router. This allowed the aluminium to be sandwich between and secured, so that it could be shaped around the template. The standard hammer shapes began to barely fit into the template once initial marks were made, and so specialized tools had to be made to fit within the template. These consisted of long pieces of wood shaped with the band saw and sander.
Once the blister shape was extruded using these tools, the edges were rounded, sanded and polished.
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