Originally Posted by Irvin
That is in one of YULitle's videos it is called a Bulky (starting) Knot http://youtu.be/UT1cXy-6Wz0 but may not work if it is a tie off the OP is talking about.
And by the same token the VS starting knot tied with a loop would not work well as a starting knot.
Being pulled through the grommet to the point where it is problematic leads me to believe it is most likely a starting knot, in which case a Bulky Knot is a good solution. If it is on a tie-off, the Bulky Knot will still easily work with any non-poly and should still be fine with his 18g if it is poly. This is my standard starting knot and, while I do apply tension, I can cinch it up by hand with all but the most gnarly strings.