This is REALLY IMPORTANT, ladies!
Please train yourselves. When removing the bobbin from the case (when it still has thread on it), it is imperative that you do not put any stress on the thread guide and/or the tension spring. If you just yank the bobbin out, the thread will pull and the spring will bend and have to be replaced. Carefully 'follow' the thread out of the thread guide with the bobbin, please. If you have not been shown how to do this, please ask a trainer.
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