The blocks are meant to be on the sides then. That's one mystery solved. I reattached the strap after emptying the tank and lifting it a little with a wedge but it immediately sagged back down onto the drain valve and that's without water in it. I may have to use some blocks or wedges to support the corner so the weight isn't on the valve. Ugggg! Not sure if the Arctic fox models are built the same but I can't imagine Northwood expected a 20 gallon water tank to be held up by plumbers tape straps and 2 little screws. Any other suggestions for a fix would be appreciated. Thanks for the responses so far.