Nice video man and thanks again for the credit!
one correction : the length of the dart is 2 palms+1 span which is 40cm (~15 3/4 in)
The English translation said 2 cubits but then corrects it to 2 palms at the bottom of the page.
2 palms metal tip + 1 span wooden shaft
the last dart I throw in my video is as good reconstruction as I could make it with the tools I had.