Which Knot?
A strong magnet fishing knot that is simple to tie, is firmly fastened, and one that will not loosen especially when holding on to heavy weights, is what you need to be ready to conquer in all conditions.
Considered to be a reliable and trustworthy knot by fishing hobbyists, the Palomar Knot is also your best choice to fish with your magnet.
How To Tie A Palomar Knot – Magnet Fishing Style

Step 1: Make a loop at one end of the rope

Step 2: Insert the loop through the eyebolt

Step 3: Loop it over on to itself

Step 4: Insert loop through

Step 5: Tighten it up a little

Step 6: Wrap it over the eyebolt

Step 7: Over until it knots with the rope

Step 8: Neatly pull to tighten

Step 9: Adjust the knot to shorten the excess rope

Step 10: Attach the eyebolt to the magnet

For more information, check out the ultimate guide for magnet fishing.