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.

The thread can break and cause skipped stitches if there is too much play in the long groove or eye of the needle.

The thread can break and become jammed if it frays on the edges of the long groove and is not guided optimally through the eye of the needle.