Here is a panel clamp thats easy to make and works great. Made with 1" square tubing,3/16th threaded rod, wing nut ,washer, 1/8th " steel rod,strip of .040 sheet . Hole in sq tubing is 5/16th to allow ***embly, weld threaded rod to small piece of sheet metal,drill 1/8th hole 1/4" below weld.Cut slot in tube with cutoff wheel and ***emble. Use as many as you need to get good results IM000205#1 pic is how it looks in action IM000201 IM000202