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Rotary sewing machines made by the White Sewing machine company along with many other brands such as:
Kenmore Rotary, Franklin Rotary, Dressmaster Rotary, and White Rotary. These machines were primary competitors to Singer and used a Friction Pulley Drive for transferring power from the motor to the sewing machine. Many of these can dry rot over the years or more commonly develop "bald spots" due to pressure on the rubber surface over long periods of non-use.
The good news is that reproduction replacements are readily available online for very little. Replacement involves a simple procedure of removing the old pulley and replacing with one of 2 sizes depending on which your machine has. You may need an Allen wrench or hex key in small size in order to attach.