@bbulla,
I watched your video.
I can't tell you specifically what
that knot is - unless I had the opportunity to carefully untie it (basically, to reverse engineer how it was tied to begin with).
If you have footage of you slowly untying it, I
might be able to tell what it was.
BTW, I've seen this same kind of shoddy work many times over myself.
Knots
not tied around the anchor string... burn marks/grooves in the edges of the grommet channels... as well as many other things.
Of the racquets that I receive (if/when they were strung by someone other than myself), I would estimate that about 80% of them have
at least one thing done wrong on them - oftentimes more than one.
There seems to be no end to the poor workmanship that can be found.
Check out the first 2 minutes here...
And the first 4 minutes here...
BTW, how long have you had your Prince 5000?
Cheers, Wes