Step 5Attach cube magnet
Spectra fishing line is strong and abrasion-resistant, but it's also a little "slippery" for knot tying purposes. We can use that to our advantage, though. Thread one end of the line through the hole in the clevis pin and tie an overhand knot around the end of the clevis. Our goal is to keep the knot small, so it doesn't show beneath the cube, so the overhand knot is a good choice for that. On the other hand, it will slip, and this is slippery line. The solution is to tie another overhand knot on the loose end of the line to act as a stop knot (see series of pictures below).
Pull the stop knot tight, then grasp the clevis pin and pull the other end of the line until the stop knot is pulled up tight against the overhand knot. Now trim the line close to the stop knot and use a flame to melt the new end of the line into a small ball. The ball keeps the stop knot from pulling through, and the stop knot keeps the overhand knot on the clevis from pulling through.
Keeping a firm grip on the cube magnet, determine which end is attracted to the disc magnet. Thread the line through so that the head of the clevis pin will be on that end of the cube.
Once the line is threaded properly, work the knot into the hole in the magnet. Pull on the line to bring the clevis pin's head into contact with the cube, it will stay put once you've got it there. If you need to remove the clevis pin, use a piece of toothpick and push from the end opposite the clevis pin head.
Tip: You can use a permanent marker to color the line black as an alternative to the default green.
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