try it this way
https://www.youtube.com/watch?v=dUPAKqS3dt8
Thanks. That's useful tip about tying the knot in the middle, as opposed to the sides which is how I did it. I will redo the test.
@Hornsweep started
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try it this way
https://www.youtube.com/watch?v=dUPAKqS3dt8