Needle will not catch the bobbin thread
Pick up hook as been knocked out of timing, remove feed dogs cover plate remove shuttle bobbin turn sewing machine in the correct rotation and watch the pickup hook it should be just about to go behind the needle when it's in it's lowest position just as it starts to rise up again the hook should now be behind the needle to pick up the cotton thread, if not get a screw driver and gently prise the pick up hook to it's correct position as mentioned above, this must be done whilst holding the hand wheel of the sewing machine without it moving, normally I would say undo the clamping screws that hold the hook assembly on the shaft but the majority of sewing machine will move back into position quite easily, but please do not prise it from the hook you can usually find and area to do this with out going near the hook once done turn by hand to make sure you have done it correctly as above when satisfied reassemble.
Happy sewing.
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