THESE ARE A STRETCH TO FIT BOBBIN WINDER RUBBER. FOR MACHINES OF THE 1800'S TO 1930'S WITH LOW HUNG BOBBIN WINDER. FOR SEWING MACHINES FROM THE 1870's TO THE 1910's. WILL FIT OLD MACHINES LIKE SINGER AND JONES PLUS OLD FRISTER AND ROSSMANN, LOTS MORE OLD MAKES AND MODELS.
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