Here's an inexpensive liner lock plus can opener tool with three lanyard/fobs, each ending with a 4 strand Walker knot.
Got the knife from:
S&W knife 8Cr13MoV stainless steel blade
the walker is sometimes frustrating to finish off, I found this
link to Walker knot helpful.
rest is TMI, unless you're interested in this kind of stuff:
-------------------------------------------------------
Here's what the end of a 4 strand walker knot looks like compared to a diamond/wall/footrope knot just below:
can see how the 4 walker strands are spread near the circumference while the other 4 are tightly centered.
and that's on the end of this GT keyring fob: