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MATERIAL NEEDED Included Not Included Varibass x2 Stacker Adjust the height of the inner cylinder to achieve the desired frequency, using the frequency ruler.
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When the product is correctly positioned, place and fix the screws in the designated positions located in the cylindrical box. The screws will fix to the foam and assure the product stability. Do not try to change the product working frequency when the screws are fixed because you can damage the product.
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