Even if your machine is an industrial the thread will jam the machine if there is any stuck round the bobbin case area, you need to check that first, if you are happy there is no thread jammed then you will have to go through a process of ellimination to find out where it is jamming, make sure the machine is oiled, it may be seizing up.
drivewithken@blueyonder.co.uk
October 2008
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