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Simply attach the hooks on a cable ring and hook The Better-Fly on the other end.
Use these extenders to perform...
If you really don't have a carabiner anywhere in sight, don't worry! You can use the High-Pulley Clip-Free Extenders in place of a carabiner by looping the strap through the triangle ring on The Better-Fly and then hooking both hooks to one cable ring.
If you really really want to use a carabiner, just clip it through the triangle opening on the steel ring as shown in the picture. Now you have the best of both worlds!