Perhaps I thought it was a metal mesh/weave based upon it's appearance.
While the PDF specifies that the outer coat of the connector he is using is a nylon braid, I've only been able to find stainless steel connectors.
If you compare
@jttheclockman's pic above as well as my own less tight effort against what's in the PDF, you can see that 'our' braids are made up of lots of very small thin wires put together in bands, where the pic in the PDF looks like two large 'threads' being used for each weave.
One thing I've noticed is that this difference means you have to be a lot more careful with the ends as it is very easy to have the wires fray if you are using the PDF's 'pull the cable tight and CA down the edges' method. (I've no idea if the problem persists when cast though).
Even with starting about an inch away from the dowel on each end, and using a very careful application of a disk sander to take the edges of the braid back to the dowel, I still had a devil of a time with those wires. (many, many a hole was poked in my fingers while working this). You can see that, even as careful as I ended up having to be, there is just that touch of fraying occurring in mine.