Sew a satin stitch (.25 on the Nova 900) in sized cotton muslin with a thin piece of paper between two plys of fabric. I prefer to use a pastel color so as not to create an optical illusion of imbalanced tension. Load the top of the machine with Metrosene 1161 thread in a dissimilar color. One can also drag or pull a piece of sized percale or muslin through the disks with the presser bar lever in a down position. This can be done by blowing out the tension disks with the presser bar lever in the up position. The top tension rarely changes and can be depended on throughout the life of that machine providing that tension assembly is maintained occasionally. For further information I can help you later on. There are other checks for tension imbalance and associated problems on the bobbin case that I won't go into here. If the tension is too tight, one must loosen the screw (past) the desired location and always make the adjustment by tightening to the correct position.
The adjustment is found on the small screw, holding the flat tension spring against the bobbin case. When the tension is right, the bobbin assembly should fall slowly and as you stop the movement, the assembly should stop. (Do not shake the bobbin assembly up and down). Gently and rapidly move your finger back and forth in a 'sideways' motion about 1/4' to create a gentle vibration on the bobbin assembly. Wind a couple of revolutions of thread around your index finger with the assembled bobbin case and hook body dangling about 6' to 12' below your finger. Attach the bobbin case to the hook body from the machine. Load the bobbin case so that the bobbin turns CW. To set the bobbin tension, wind a genuine Bernina bobbin with Metrosene thread, type 1161 white thread as your 'gaging thread'. Do you have a genuine Bernina bobbin casing and not an Oriental copy? If yes, proceed as follows: 2. 8 Answers SOURCE: Bobbin Tension Adjustment: 1.Use only attachments recommended by the manufacturer as contained in this owner’s manual. What could be the problem? Finesse sewing machine user manual. I am using a finesse 356 sewing machine and the thread keeps on breaking off at the needle.
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