Clamp
Progressive Engineering turntables clamp the record to the platter. This
flattens out warps, and it also couples the LP tightly to the platter so
internal resonances can be transmitted away from the stylus. The Turntable
makes use of a screw-down clamp and tapered washer to tightly press the
record down onto the flat platter, right to its edges.

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The Turntable - full text