Need user manual for the Singer 57815

You need to look in your manual for instructions. usually, the bobbin just slots in, but, every machine is different.

First, take a look at page 68 in your user's manual. If you don't have it, you can download it free at the Singer Sewing machine site. You can (and periodically should) remove the face plate over the thread path for cleaning and oiling. There are probably threads wrapped around a part there, and in addition, you can take a flashlight and look to see if there might be threads underneath the bobbin winder preventing the machine from moving.

More rarely (but possible) there may be threads wrapped around the gear underneath the bobbin basket (holds the bobbin case), so you ,may need to remove the base to access that part, but it's generally not a difficult process.

While you are there, it's probably time to use a little sewing machine oil and lubricate the parts, as per your user's manual.

try this link for a manual http://www.singerco.com/uploads/download/1270_57815.pdf

Well, there are a number of sites that have parts for older machines. Just doing a quick search, I found a copy of the user's manual at SINGER MAGIC 8134 8234 Sewing Machine Instruction Book User Manual . You might also check eBay; they generally have a wide range of parts and accessories for older machines.

here's a free manual from singer on the sewing machine, just
click on the link

http://www.singerco.com/uploads/download/1270_57815.pdf

have you tried any of these sites

sewingpartsonline.com
sewvacdoctor.com
sewingpartsdirect.com
whitesewingcenter.com
sewingsupplywarehouse.com
sewforless.com

Hello

Reduce the thread tension to a lower number,Select a larger size needle,Remove and reinsert a new needle, flat side toward the back of the machine

A free, downloadable manual for the Singer #9134 can be found here: http://www.managemylife.com/mmh/lis_pdf/OWNM/1006499L.pdf
Sears has an excellent, easy-to-use catalog of your machine's parts for sale. You can find those parts at: http://www.searspartsdirect.com/partsdirect/part-model/Singer-Parts/Sewing-Parts/Model-9134/1232/1220000
If you find that Sears is missing a part that you need, you can look up that part in this manual, record the serial number of the part, and continue your search at another authorized Singer retailer: http://parts.singerco.com/CPpartCharts/9_99999/9134.pdf
Good luck with the refurbishment of your newly acquired Singer!

I downloaded your manual for free at www.singerco.com and I be darned, I see why you are baffled. Call Singer at 1-800-4singer and ask them to tell you. This is a first for me to see in a machine that is not that old, my 45 year old Kenmore has the blind stitch setting. There has to be some answer to this.

http://www.singerco.com/resources/bobbin.html You can find step by step instructions on this webpage.