I really need to make one of those swing out carts for sheet goods. Right now the stuff is just laying up against the wall. To save a couple of inches it’s nearly upright. A couple of slightly bowed sheets of plywood always want to push everything away from the wall and fall down. And today they did. So I came up with a simple solution using an old dog collar and a hex key that came with some IKEA furniture.
One end screwed to the wall. The hex key through the buckle holes. Nothing but tension holding it in place. Seems study enough and it’s adjustable. :-)