I believe your model is a 77.
For a manual try:
http://www.singerco.com/support/instruction-manuals . In the search box type in W77 ('W' being for White).
Put the lever on 'S', then use the front dial to set the acual tension. You can use the lever for fine tuning when using attachments without having to move the dial.
Originally Posted by
kpelletier83
It sews great and I had it on the M. I thought it may have something to do with the tension although the main tension dial in on the front.
I don't have the manual but I found a downloadable one for a different model that is almost the same, except for this lever. The one in the manual has the flat plate like the one mentioned by QuiltingVagabond.
Mine is 1954. I called Husqvarna and gave them the serial number and they look it up for you. Pretty cool.
Thank you for the help. I will experiment with it. I have no extra feet with this one. Just one bobbin. Thats ok. I don't need the extra feet. Maybe a couple more bobbins.