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The carrier and bobbin are removed. Place the thread in the carrier with the thread dispensing counterclockwise. Place the thread between the metal pieces (tension). let the carrier hang from your finger and bob it slightly. It should extend one inch. If it doesn't then you can adjust it by turning the small screw slightly until it does what I said. Now, replace this assembly. The top tension you can start at three. The sewing should be an even pull between the upper and lower thread. If the thread knot is in the center of the material it is right. If the knot is under the material then raise the upper tension. If the knot is on the upper material then you should lower the upper tension. The key is to start with the bobbin tension correct and adjust the upper tension until the knot is in the center of the fabric
Make certain you are passing the thread through the tension for the bobbin winder when setting up to wind the bobbin. Check that tension assembly for anything that could be stuck in it, preventing the assembly from putting tension on your thread, such as another thread. Wiggle the disc on the assembly to make sure it isn't stuck. If none of that works, disassemble that assembly from the top of the machine (NOT the tension you use when threading to sew!) and see if the spring inside is broken. If it is, replace the spring if you can get it, or the whole assembly if you cannot.
Can't get a manual for you but here's how to wind a bobbin. Guide your thread from the spool holder to the bobbin thread tension device on the top left side of the machine.(That's the round assembly that is about 1/2 inch in diameter with a screw in the center of it.) Pull the thread in the front and wrap it to the back and continue towards the bobbin winder on the right side top. Wrap thread around the bobbin, place the bobbin on the spindle sticking up. Release the handwheel(either by pulling out on the center of the wheel or twisting on the center of the wheel). Press on the foot control. It should stop winding when it is full. To thread the machine
all machines thread the same. TTN tension,take up,needle.
Beginning with the spool, guide the
thread through the thread guides to the tension assembly. Pull the thread
through the tension assembly and test it to make sure the tension is working
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it passes this test, continue up through the
take up lever,then down through the thread guides to the needle. Make sure your
needle is fully inserted and turned the correct way. Flat side to the back and it threads front to back
I would first make sure the thread tension is adjusted properly. if this does not fix your issue, check the point on the shuttle hook and make sure it is not broken off. it should come to a needle sharp point. if the tip is broken off it may not pick up the thread from the needle properly. then double check the timing and the needle shaft depth. first, make sure your needle is fully seated and tightened down. the groove in the needle should face forward. there are two timing marks on the needle shaft. at maximum depth you should see both lines and the top line should be right at the bottom of the needle shaft bushing. then as the shaft goes back up, when the bottom line is at the bottom of the bushing the point of the shuttle hook should be right behind the needle and centered in the indentation on the back of the needle. you may need to make minor adjustments on the needle shaft depth depending on what brand and type of needles you are using.