It's so easy to use too. Just cut a length of wire (I like to use wire that is about 18 - 20 gauge for a nice sturdy headpin), make sure it's pretty straight, open up the jaws of the clip, push the wire down inside leaving it sticking out an inch or two so you're not overheating the tool, and get to work making your headpin. Since the wire is nice and stable, it is really easy to make anything you'd like on the end of the wire. I decided to try making some hearts and was very pleased.
When you're ready to put the headpin into your kiln, swish it through the flame, grab a bit of the wire between the tool and the glass with a pair of tweezers or a locking hemostat, open up the jaws and pull it out. Caution: the tab of the tool may be a bit hot, so give it a quick test before you press down. Craig put little thumb tab on the tool to keep it touchably warm- just in case you put it right into the flame.
There's a bit more info on how I make headpins here.
Here are some of the results. Need one? You can get it from Arrow Springs! They call it a broach clip.