Double Stick Tape usually isn't strong enough to hold by itself on hair clips, especially on the backside of the clip. Our solution is to use E6000 on the backside. Apply E6000 and let it dry overnight.
The next day apply the double stick tape.
You can go all the way to the edge with tape or leave a tail to tack with E6000.
Use a toothpick or syringe to apply a little bit of glue on to the tail.
Clamp to a no stick surface (waxed paper or cutting board) to dry overnight.
We use Sealah No Sew Tape