Hi
You can get a replacement manual for your machine from the Singer site, but they cost around $15.
http://www.singerco.com/accessories/manuals.html
Just type in the model number (640) and click on search.
The Singer site have a usefully FAQs section.
http://www.singerco.com/support/faqs.html
Just click on the question My needle keeps breaking and the answer will appear.
Hope this helps!
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