This weekend, Jim added the fifth and final diy chalkboard to our gallery wall. He also fixed the others, which were really crooked. He used self adhesive rubber bumpers, which can be found at your local hardware store, to straighten out the chalkboard which were crooked.
They are super easy to use, you just apply them to the back of the frame on the corners. Then straighten them to where you would like. The bumpers are also helpful to protect furniture, we have similar ones on our bedroom furniture, which hold the glass tops onto our dresser and nightstands. I'm not actually sure they are supposed to be used for straightening wall hangings, but Jim thought they would work and they did, which is helpful since a few of the frames were looking too crooked to me.
Are there any products you use for something other than their intended use?