The method I use to join binding is simple and quick. By the time it takes you to find any gadget you may have to help you join your binding you could already have your binding joined using this method.
I have cut my binding at 2 1/2 inches wide but of course this will change if you are using bias binding to trim the edge of a project etc. I do not iron a crease in my binding before I apply it as the binding need to be slightly larger on one side than the other to all for the turning to the other side .
Before you begin turn the edge of the binding down to meet the other side as shown. Place a pin on the edge to mark this spot. Do not remove it.
Fold your binding back in half and begin stitching it on starting approximately 5-6 inches from the edge as shown.
Continue stitching your binding on until you are about 6 -8 inches from where you began stitching. Lay this end of the binding over the top of the binding at the beginning and trim so that the edge finishes a scant 1/8 inch from the pin you placed at the beginning.
Open out both ends of binding as shown
Place the two ends right sides together as shown and join as you do when joining the binding strips together in a long string at the beginning.
Trim the seam, finger press flat and then refold to complete stitching your binding to your project. Your bindng should fit nice and snugly.