Is this a very old machine because the manual I"ve located doesn' look like the image on Fixya.
Try this link
http://www.singerco.com/uploads/download/997_white-117.-kenmore-x.pdf
Singer have various model manuals downloadable, you just need to search them at their website page
http://www.singerco.com/accessories/instruction-manuals/search
Trust this helps you out.
If you don't resolve the issue and this is a vintage machine, then there is some good user groups such as Vintage Singers under Yahoo where enthusiasts share info on their old machines. Good to lurk though or go through old threads first as there is often someone else who has asked similar question in the past. There may also be manuals in their files so have a dig around.
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