Silk and nylon together for stringing beads?

Thanks so much for all the about knotting between beads.

One more question: several people mentioned using both silk and
nylon together when stringing heavier beads.

What is the technique to do this? Do you knot with the silk
around the nylon (Beadalon, or whatever) so that the nylon is

Thanks in advance,
Marcie Mullaney