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The service manual for that machine can probably show you, and I would make sure and get the parts list as well. I just checked Sewing Parts Online, and it was not listed, but if you send an email to them (they give the address at the top of the page), they can and will purchase it for you. Usually takes about 2 weeks. However, I just saw a used one in nice shape on eBay for $72.99 and $27 shipping in the original box, so you might consider just buying another one. I also noticed that a new tension assembly is being sold for $18.95 including shipping, and if you write to them, they may include replacement instructions. Just do a search on Singer 4525 on ebay--they have all kinds of bobbins, foot pedals, and parts for it.
There is one for sale on eBay right now for $12.99. http://www.ebay.com/itm/Singer-Merritt-Sewing-Machine-Replacement-Tension-Assembly-Model-2404-/151468509588?pt=LH_DefaultDomain_0&hash=item23443a0994
You will find the parts list most helpful, because it will show you with drawings where each part is supposed to go. Go to the Singer site, and type "parts chart" in the Search box, then select Sewing Machines and the 9 - 900 series. Scroll down; it's towards the bottom.
Remember to have the take up lever down when you start to sew and make sure there is not one piece of thread stuck in the raceway, to access the motor if you have to will mean seperating the body and it is not easy
Wow, one of the few Singer machines that doesn't have a free download manual. Hmmm..... Ok looked up a photo of your machine. It's pretty easy.
1. raise your presser foot. 2. Put thread on spool pin. 3. draw thread over to and under from behind of the pre-tension disc at top 4. Draw thread down from the right and under the tension dial to seat the thread into the tension discs and flex that spring a little. 5. Through the take up lever. 6. Down through the thread guide. 7. Down through the needle bar thread guide. 8. Through the needle.