Needle/Thread Combination

The needle/thread combination is correct, when the thread fits perfectly into the long groove and goes easily through the needle eye. This allows the thread to be stitched optimally.

If the thread has too much room to move in the long groove and in the needle eye, this can result in the thread breaking or missing stitches.

If the thread rubs along the edge of the long groove and cannot be guided properly through the needle eye, this can result in the thread breaking or jamming.