Lightweight construction is necessary to reduce mass, yet rigidity is also essential. Tubular aluminium, magnesium, and wood have been used, and the shells skeletonised. Low friction pivots require forces of no more than 2-50 mg maximum applied at the stylus, to move the arm horizontally or vertically. Unipivots are often used to achieve this.
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Tone arm construction --
Lightweight construction is necessary to reduce mass, yet rigidity is also essential. Tubular aluminium, magnesium, and wood have been used, and the shells skeletonised. Low friction pivots require forces of no more than 2-50 mg maximum applied at the stylus, to move the arm horizontally or vertically. Unipivots are often used to achieve this.
