. 5 Answers SOURCE: The top tension is dependent not just on the tension dial, but also on the little disks that you go through to thread the machine.
If it is not threaded correctly, you will get bunching underneath. Sometimes I just have to rethread the machine- when you get to the disks- hold the thread taut and push it through the disks before going up to the arm part. Here is a threading picture I found- but it doesn't point out the disks too much. Once the machine is stitching nicely, then the tension dial can be used to flatten out the stitches. Posted on Mar 14, 2009.
![Manual Manual](http://media.liveauctiongroup.net/i/33799/29050475_1.jpg?v=8D56691F576FC20)
Brother db2-b790-3 doble arrastre brother db2-b791-705 coser cortahilos doble arrastre motor brother brother db2-b791-713 coser cortahilos doble arrastre. Corta.manual x cortadora vertical de tejidos cortadora cortadora cinta cortadora cinta continua cortadora ci modelo cortadora cinta continua.