Audio Technica AT-666 hand pump for pumping out the air between the record and the mat, which aligns the records with a pressure of 250-300 kg.

The AT661 is available in two versions: manual and a slightly later version replaced the manual suction with the automatic battery-powered AT661,

which offered the advantage that AT666 + AT-661 allows smart MC (and MM) cartridges to move along the groove without distortion.