I am making some necklaces for my store, and I've been using a basic kumihimo technique, but the thread I've been using is thin enough that no matter how tight I close the jump ring with the pendant on it, it winds up falling off the necklace. I've decided that the best solution may be to solder the jump ring closed, but I'm worried that the heat on the jump ring might be enough to burn the thread, and with kumihimo, it's pretty much impossible to put the jump ring and pendant on the necklace until the rest of the necklace is done. anyone have any ideas? is there any way to keep the thread safe while I solder the jump ring? am I being paranoid about the heat issue?