Thanks, Nick. I'll go make that thread.
When I tried to coil my cable the first time, I used a thin rod and a hair dryer. I wrapped the cable around the rod and heated it with the hair dryer, but that didn't last, so I tried it again with a heat gun. That lasted a bit longer, but came out again. This final time, I used the heat gun almost to the point of melting the cable's outer housing and then let it sit until it reached room temperature. Then, I unwrapped it the next day and did not use it for a few days, just to let it stay coiled. Now, I'm using it, but it is already coming uncoiled. It stays more or less coiled, but not tight like a cable you can buy.