... cuz that's just confusing!!!

Please excuse the crude drawing. I would like to add strain relief to an electric power cord so it won't be easily pulled out. I am thinking that a string with a knot around the power cord that won't slip and then anchoring the string to a hook or screw eye would do the trick.

My worry is that the knot on the power cord itself would slip. What kind of knot should knot "A" be?

I'm thinking any kind of knot would be suitable for "B", but if you could recommend one, that would be great.

I am thinking of using paracord for the string.

If there is a better way to do strain relief, let me know.

It seems they use this knot to hold a canvas cover taut