I have tried standard hooks that fit into the channel. But it slides all the way down towards the bottom of the panel. I would like to have them in the best position for the sun and to save space in the greenhouse by using the empty 2 feet of space at the top of my GH. With hooks such as these that lock, I can have them hooked very near to the center beam which, btw, does not have a channel (see original pic)
