Step 1: Materials Needed
550 paracord. 50 ft length and rated at 100 lbs. Available at local big box hardware store for about $4
Magnets. Two kinds are used in my project. I salvaged the kidney bean shaped magnets from disassembled hard drives work was sending to the shredder. "Free" other than the time to pull them. I'm guessing 5 lb pull. To augment, I ordered 12 additional ones from KJ Magnetics (part number: DX01-N52). 1 inch diameter, rated at 8.5 lbs pull. Figure $35 - $40 shipped if you can find a coupon code or not.
Metal bar stock (steel or aluminum). For $8, I got a 1/8 inch thick, 2 inch wide by 36 inch long steel bar from local big box hardware store. I choose steel. However, there's some good arguments for using aluminum underwater.
Newspaper. For painting on. Pick up a store advertisement flyer.
Sandpaper - laying around from another project. New say $4
Spraypaint - laying around from another project. New say $7.
WaterWeld. By the makers of JB Weld, it's a two part adhesive designed for use in and under water. that one can use to glue metals together so it'll hold in a submerged environment. Available at local big box hardware store. Ask a store associate as it's not consistent as to which dept (plumbing, or near the tape) even at the same name brand store in the same town. $6
Material cost: $64
Step 2: Tools Needed
Drill - I used a cordless hand drill
Leather gloves - protection when cutting and drilling metal
Hearing protection - when cutting and drilling metal
Measuring tape or Ruler
Nitrile gloves (when using the water weld stuff). These I picked up at Walmart. Harbor Freight stocks some good ones as well.
Safety glasses (for flying metal bits from drilling. You don't want a metal shard into your eyeball.)
Drill press - If you have one or access to one, then that'll make it go that much quicker.
V-DrillGuide by Big Gator. This makes it so easy to guide the drill for a proper hole to run the rope through.
Step 3: Cut Bar to Size
Step 4: Drill Rope Hole
Step 5: Sand and Mark Magnet Locations
Step 6: Attach the Magnents Using the Adhesive
To use waterweld, think Play-doh. Cut a peice off with a plastic knife. You'll notice a white outside with a gray center. Squish together making a small ball Then smush the magnet onto the steel. Watch fingers as the magnet will be attracted to the steel.
Step 7: Attach the Magnents Using the Adhesive (continued)
Step 8: Paint
Paint a second coat.
Design Note: I used spraypaint as it's what I had laying around. This to help keep the steel from rusting. I did read about using "Plastidip". In retrospect, I wished I had.
Step 9: Rope
Step 10: Results of Testing
This is my first instructable. After visiting the site for a long time, I finally got to contribute back. As I find new/different items, I may post here. If you have questions, please send me a message or discuss below.