How do I wind thread in the bobbin?
SOURCE: Brother Sewing Machine model:CS8150 bobbin thread problems
The top of the machine is not threaded correctly. First raise the presserfot then rethread the machine. Bottom looping is usually caused by a lack of top tension. There could allso be a bur on the hook.
SOURCE: brother sewing machine ls2125
Don't go directly from the thread spool to the bobbin.
You have to go via the thread quide, (near the end of the head at left side) and under the small roller.
Pass your thread to the bobbin turn your thread 3 turns to the right, clockwise,
then pass the end of the thread, under the coming thread and give it another 3 turns to the right.
For better results, always remove old thread from bobbin before filling it up.
Push the thread winder lever to lock the bobbin.
Start winding slowly. If the thread is loading in the down position,
put your finger under the thread between the bobbin and the the thread quide, untill you see that the thread is feeding evenly.
SOURCE: Can't wind the bobbin
Hi again,
Well we finally downloaded a service manual that cost a few bucks, then finished getting the machine apart, then found a small rubber O-ring that had obviously gotten hot when spinning after the tangling of the thread on the bobbin stem. You could see where the heat had melted tiny teeth marks in the ring and it was stretched out of shape. It and yours too will need to be replaced.
If you or someone you know is mechanically inclined, you will need to take five screws out of the back including a hard to find one under the foot raising lever (lower the foot), then one form the front that is under the thread cartridge, and you will have to remove the bobbin winding plate cover which is held by one small screw, and then remove a small screw from the support bar.
Good luck!
SOURCE: cannot thread bobbin
If I remember correctly this machine has a little arm in the bobbin case area. You will need to open the slide plate, move that arm towards the middle of the bobbin. Thread your machine as normal, take the thread going through the needle eye and wrap it around the thumb screw a couple times, then start "sewing" your bobbin should begin filling, once started, you can release the thread wrapped around the thumbscrew. Once filled, you simply close the slide plate and that moves the arm back into place and start sewing.
Pre-tension disk 
Bobbin winder shaft 
Bobbin
Pre-tension disk 
Pulling it in as far as possible
Spring on the shaft 
Groove of the bobbin
Sewing speed controller
Wound evenly 
Wound poorly99 views
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