When you switch off the machine, turn your hand wheel towards you, if the hand wheel can move freely but the needle bar does not, three possibilities on most machines - the upright gear has worn out or the timing gear is worn out or the the timing belt loose or broken.
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When you switch off the machine, turn your hand wheel towards you, if the hand wheel can move freely but the needle bar does not, three possibilities on most machines - the upright gear has worn out or the timing gear is worn out or the the timing belt loose or broken.