most machines will have a rubber o ring as part of the bobbin winding mechanism, when you engage the bobbin winder, this o-ring will move over against the main engine drive wheel and this then makes the bobbin spindle turn. So yes, you may need to replace the rubber o-ring, they can perish and wear. Called Bobbin Winder Tyre, you could try
www.sewingpartsonline.com, they have loads of Kenmore models listed but can't see yours. However, if you email them, they should be able to advise what part number it is. If you start by opening up the machine case and take a look at the bobbin winder area first, you may find this rubber has split or perished.
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