The 2 strand matthew walker knot is suitable for lanyards, zipper pulls, key ring fobs. It is s good knot for finishing off a two strand bit of knotting.
When tied using a series of wall knots aligning the strands can be a bit fiddly.
Tying the knot around a mandrel overcomes this problem
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With a rubber band attach two pencils (small dowels) together.
Attach your cord to the pencils as shown
Take either strand and bring it between the pencils and wrap around desired number of times.
And bring the end through those wraps (making a overhand knot in the middle.
Bring the other end on the other side through the wraps.
And begin to wrap the end one time.
And four times.
With a hemostat, needle nose pliers, grab the end and pull it through the knot (making overhand knot in the middle)
Remove one pencil and start to tighten. Remove remaininng pencil and complete tightening process.
You can make this MWK any length. In step 3/4 wrap first strand around one time followed by strand two to get this.
Likewise if you wrap around twice times you will come up with this
Wrap three times
Using two colors gives a striped result