The speed control is brutally simple: a carbon-pile rheostat in series with the 120 VAC 1 A sewing machine motor.
How to Identify Kenmore Left Homing presser feet and Center Homing presser feet
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Slow down vintage machines/prevent overheating foot controllers
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Cutex Foot Control Pedal W/ 3 Uneven Prong #6811, 6812 for Kenmore Sewing Machine
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Foot Control Kenmore Sewing Machine Parts & Attachments for Kenmore
Kenmore Sewing Machine Feet and Adapters version 2
Cutex Foot Control Pedal w/ 3 Uneven Prong #6811 6812 for Kenmore Sewing Machine
Kenmore sewing machine Foot Pedals
Sew-link Foot Control w/Cord for Kenmore 48.12060, 148.12071, 148.12140