Thank you for the great pix of the mechanism, I flipped my machine today to look around, I need to purchase some machine grease for it. I noticed the manual also called for kerosene on some of the fittings if the machine had been sitting for some time. I know the kerosene will dissolve the old hardened grease to make it easier to loosen parts.

kerosene is too messy - use Triflow

And it smells to high heaven too!! I have to go out later, I'll stop in Lowes and see if they have the Triflow, thanks!1

get triflow at a bike shop or sew classic

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I have a few questions for you----how can you tell exactly what model the singer 15 is? I have friends that want to sell me their machine...I looked up the serial number...AD8?4959...there are no manuals or accessories---and it is in a
rather modern looking cabinet....is this how they came? I can send you a picture if you can possible help me....I need to
find its worth so I can know what to offer them for it....Thank you in advance.......RJ from Washington state

Ok here is a link to something on the Japanese copies but there are links to articles on the Singer 15 on that thread: http://www.quiltingboard.com/picture...p-t164361.html

Here is a link where you can go to determine what model your machine is: http://www.sandman-collectibles.com/...r-machines.htm. Apparently the potted motor is the what determines mine to be a 15-91. Use the serial number lists to find the main model number, and the sandman link will help with the secondary.