Answer
Thi bead protects the knot from the sliding sinker. it is placed between the knot and the sinker
I would not suggest using a bead to protect your knot. The beads edges around the hole on both sides can become sharp and cut/fray your line at the knot causing it to become weak.
I would recommend using silicone airline tubing (you can get this at your local fish store, i use the mini) or the "Owner" soft beads, either of the 2 will protect your knot with no worries.
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Hope this helps
