We've got an old stove and the oven valve is broken -- the knob melted and we couldn't find a replacement. We were using a screw driver and pliers to turn it on (screw driver to push in the spring lock and pliers to turn it.) Now that's broken too and gas comes out of the hole in the center of where the knob goes on if we try to turn it on.
I was thinking of maybe removing the whole control and seeing if anyone might have a replacement. Can't find a make of model anywhere on the stove.