I work with a group of local kids, teaching them to build and fly Half-A control line planes with Cox reed valve engines. I supply all materials, engines, and so on. Our favorite glowplug clip is the one shown in the attached photo, but I can't seem to find any more of them. The ones available now are larger, and don't fit as well. Does anyone know where to buy them? Or maybe some of you might have one that you no longer use? I would like to give some to the kids so they can use on their own when I'm not there. Thanks.