For petanque players with back issues, a magnetic boule lifter can be a life-saver. You can buy one on the web, or you can make your own. This design for a home-made lifter is actually better than some of the ones you see for sale on the web.
We’re going to be using epoxy putty, so you will need some tools to shape the putty after it has set. You can use a small file, some rough sandpaper, or a dremel tool. A knife will also be handy.
All of the materials should be available at your local hardware store. You’ll need to purchase some simple hardware, a neodymium magnet, and some epoxy putty. When I did this project in June 2021 in Tucson, Arizona, the total cost of materials was between $15 and $20.
At my local hardware store, the hardware cost me less than 3 dollars.
- one eye bolt
- enough nuts to fill all the threads of the eye bolt
- two one-inch fender washers
The magnet is a neodymium disc magnet, 18mm in diameter and 3mm thick. I found a 3-pack at my local hardware store for $6.60, or $2.20 per magnet.
The magnet is a smooth shiny disc, about the size of a U.S. 5-cent (nickel) coin. For something so small, it is surprisingly powerful. It can easily lift a boule.
The epoxy putty cost about 8 dollars. I chose this particular flavor of putty because it is specifically formulated to work with steel. But I think that almost any kind or brand of epoxy putty would work.
Cut off a small chunk of epoxy putty and knead it in your hands to mix the two epoxy components. The putty will start to set up very quickly— within two or three minutes— so work only with small amounts of putty and work quickly. Later, if you need more, you can add more.
Press the second washer onto the putty, so the two washers make a putty “sandwich”. Push down hard on the washer to make sure that is pressing against the nut. Some putty will squish out of the sides. If necessary, push extruded putty back between the washers, so the space between the washers is completely filled with putty. Make sure that the second washer is centered and in line with the first washer.
Stand the whole assembly on its “face”, with the handle up, so you can check that the second washer isn’t tilted. If the putty is still fairly soft, try to use a knife to cut down and trim off excess putty from around the washers. This is not absolutely essential, but if you can do it, it will save you some cleanup work later.
Let the epoxy sit so that it has time to cure. An hour should do it, but check the instructions on the package. Once the epoxy has hardened, the washer/putty sandwich will make a solid base for the magnet.
Take enough putty to make a ball a little bit bigger than the magnet. Place the ball of putty in the center of the second washer. Place the magnet on the ball of putty and push the magnet as hard as you can down onto the washer. Putty will squish out around the sides of the magnet. You want that to happen, because you’re going to use that squished-out putty. (Ideally, we want putty to squish out all the way to the edge of the washer. I made the mistake of not using enough putty, and as you can see in this picture, the squished-out putty didn’t reach the edge of the washer. After I took this picture, I had to quickly add some more putty around the edge of the magnet.)
Now you need to work quickly. You want to create a continuous ring of putty around the magnet, filling the space between the edge of the magnet and the edge of the washer. If you need to, gently push the squished-out putty into place. If there is any putty on the face of the magnet, push it away so that the face of the magnet is completely exposed. Gently push down any high bumps of putty around the face of the magnet.
At this point you’ve finished the most difficult part of the project. The rounded shoulder of epoxy supports and protects the edge of the magnet. It also makes it easier for you to tip the magnet over and lift it away from a picked-up boule.
When you attach a cord and a ring, your lifter will be ready to use. Note that I say “cord”, not “string”. Strings are strong enough to do the job, but they get tangled easily because they are so thin and flexible. Something thicker and stiffer — a cord— won’t tangle so easily. See the picture below.
Select a metal ring that can be grabbed by the magnet. That way you can wear the lifter like a necklace when you’re not using it. An ordinary round split metal key ring works well. A bit classier is a “welded ring” like the one in the picture, which I got at my local hardware store for $1.60.
The boule lifter is now ready to be used. There is a photo of the finished product at the top of this page.
Neodymium magnets are brittle. This design, like commercial boule lifters, provides good support for the back and sides of the magnet, so I expect it to be as durable as any commercial boule-lifter. Over the next few months I will use it regularly and report on what I find.
[June 22, 2021]
After three months (80 hours) of regular use, the collar around the magnet suddenly and completely broke away. It looks like there was poor adhesion between the epoxy putty of the collar and the zinc-coated washer to which it was attached.
I made a new collar using a traditional clear epoxy gel, which I think might hold onto the washer better than the epoxy putty that I originally used. To be on the safe side, I also slopped a little extra epoxy onto the sides of the lifter. If I were to do this project again, I think I would abandon the epoxy putty that I originally used, and use a traditional epoxy gel everywhere.
As before, over the next few months I will use it regularly and report on what I find.
[September 22, 2021]