I use Robline spliced to 1/4 Vectran. I like it alot. I put holes in the sides of each then run the other through so it will be in a locked position (similar to how a figure eight locks). Then I push the tails into the opposite side to hide them. You will need to shave the Robline into a taper before stuffing. The Vectran goes in okay.

Later,
Dan