It is a controversial device wrapped in mythology. The trouble with it is that we don't really know how to optimize it, how it originally made the guitar sound, and why it stopped being used. There are very few extant examples of guitars with Tornavoces still in place.
Many, many, builders denounce the Tornavoz as mumbo-jumbo. I'm putting it in anyways!
Some copper sheeting and some mold making material.
Draw the diameters of the cone section and cut it out on the bandsaw.
Sand it fair and cover it with packing tape. Packing tape is my universal mold release agent.
And wrap it in fiberglass, about 4 layers do the job.
The laminate is off, the pattern made, and the copper cut to shape.
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