What is possible cause of the mounting bolt for the needle thread tension assembly breaking off at base of split?
By Larry
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The answer could range from forcing an incorrect threading path to a broken gear or tension disc, and includes mistakes like running the machine too fast, using the wrong size needle and then forcing the fabric through (by pulling-pushing, thus putting too much strain on the feed dogs and needle areas).
The answer could also depend on the age of the machine - a vintage machine built in the late 60s and onwards could have silicone or plastic gears that have seized OR given way.
No matter what brought the machine to the breaking point, the problem took time to develop. Whatever the age of your machine, it would be best to take it to a qualified repair tech for repair, servicing, and an explanation as to the cause.
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