Perhaps a manual would be helpful:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjgksb12OPSAhVQyGMKHa45ARMQFggiMAE&url=http%3A%2F%2Fwww.husqvarnaviking.com%2FSiteFiles%2FClientSite%2Fc0%2Fc069c236-d0ee-4d49-8dd6-5b1e97894010.pdf&usg=AFQjCNEjkSe8T8eCl7KH75CVnBJw_tVmLQ&cad=rja
Husqvarna 150 classica manual Google Search
Husqvarna Classica 90 User Manual Removing Bobbin Case Bobbin Winding
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