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Foam pad width: 4.2 mm ~ 5mm
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depth: 1.56 mm (min) + 1.43mm = ~ 3mm
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they really have to stick out an additional 4mm
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in order to make contact with the ball.
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So an ideal depth is 7mm
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screws:
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1.8mm x 6.5mm (absolute minimum height)
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best 1.8mm x 8mm or more
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( 1/16" or 15# )
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