Service manuals and other booklets for Husqvarna Viking Model 5710 Sewing Machine(1960) can be found at the link I am providing below but upon payment. Its a warehouse for service manuals and other related booklets of renowned sewing machines models. I hope it will prove helpful for you.
<a href="www.sewconsult.com/husqvarna_instruction_manual.htm">manual</a>
<a href="www.sewconsult.com/husqvarna_instruction_manual.htm">manual</a>