just some metal wire, so I've made two U's of the right height
out of coat hanger, and wired two of the uprights together so
it folds flat.
Let's see if I have some pics...
in action, under the penny stove:
if you look carefully you can see the wired together upright on the left:
Aha, finally, a visible picture:
Made a taller and bigger one for use with the borde bomb