Sewing machine jams only when shuttle/bobbin case is installed
My sewing machine jams as soon as I install the shuttle/bobbin case. The top rod (take-up lever) stops moving entirely when the shuttle is in place, but the machine runs smoothly when the shuttle is removed. I have cleaned out the lint and checked for basic jams, but the issue persists. Is this a shuttle timing issue or an alignment problem with the shuttle race? It is an Indian-style machine (similar to Usha/Singer manual models). Any advice on how to align the hook or reset the timing would be appreciated.
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