There are some places where the kerfed lining is missing. These are the greatest little clamps. I found them one day at the dollar store, six in a package. I used to use clothespins wrapped in rubber bands, but on triangular binding like this if one doesn't get the placement just right they tend to pull the lining strip up. These things have swiveling pads. Rotate the inner pad out of the way and there's a little notch that keeps everything exactly in position.