Finishing the locked Brummel

[Brion Toss]

Hi again,
First, be sure that you are passing the eye through the hockle in the same direction that the end went through. Otherwise you'll get an extra-hockled hockle.
For stiffer line, I pass a length of stout twine up through the hockle, through the eye, then back down through the hockle, and then use the twine to pull the eye through. Massaging as it goes helps, as does using a fid to open up the hockle beforehand.
As for the twine type, plain ol' waxed sail twine is as good as it gets.
Keep at it!
Fair leads,
Brion Toss