Question about Brother XL-3510 Mechanical Sewing Machine
I had the opposite problem it may be that the lower tension is too tight (mine was too loose).
To fix it you have to take the bobbin case out completely to access the tension adjustment screw. - Remove the 2 screws holding the metal plate with a nickel and remove the plastic piece over the bobbin case - there is a small metal lever on the lower left side that needs to be pressed down. You can then remove the bobbin case. There are 3 screws - the center one is the tension adjustment. It was painted green on my machine. It appears that it is not a regular setting change, but a bad adjustment from the factory. So if you don't feel comfortable doing all that returning the machine for another will likely fix the issue.
Posted on Mar 26, 2009
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