Step 1: Stuff You Need
- Some Polycaprolactone granules. Also known by the trade-names "Shapelock" and "Polymorph", it's the polymer that becomes soft at 60 degrees C.
- Some elastic cord.
- Two neodymium magnets, bought from an on-line specialist in high-power magnets. One is a .75" disk. The other a .5" disk with a countersunk hole. Though I'm fairly sure a plain, smaller magnet would've worked just as well.
- A thick split-ring salvaged from an key-ring.