If the little old lady has talked you into using this frame for a 16x20, then things get a little dicier....
The composition of the wood would make a big difference. Without knowing its strength, I'd be scared to recommend anything for cc. Anything else, I'm sure flangers would be fine.
Is it basswood?
I'd try calling the maker to see what they'd recommend. That way, if it flops...its at least their recommendation.
The double sawtooth idea reminded me of something. You can put one end of each of the sawteeth (sawtooths?) on the top rail and the other on the vertical rail and have a slight slope to it a la Wallbuddies. This would transfer some of the weight to the vertical rails and help prevent the top rail from bowing upward. I would bore out the holes in the sawtooth hangers and use a #2 x 3/8" pan head screw to attach as opposeed to the 3/8" CC nails that come with.
If the frame has strips of Tyvek glued with PVA to its rabbet wall, these strips can be adhered to a solid backing board, like Dibond or D-lite, with hot melt glue to pull the sides of the frame tight.
The hainging device can be built into the support/backinb board, before the frame is closed, by running flat head bolts through the sheet (head side in) and fixing D-ring hangers to these with nuts.
Normal 2mm Dibiond should be stong enough to take the load and a wire between the D-ring could be used with little chance of causing deformation of the Dibond.
Hugh
The composition of the wood would make a big difference.
For that minimalist look you really should be looking at the Neilsen 121-122-123-124 series. You get thin faces and strong backs for hangers.
We were just told that the frame is made from cherry wood.
Most cherry is soft, unless its Brazilian.
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