Originally Posted by Scrodzilla

Rookie mistake # 2: You can use a double strap with those pedals. Just pretend there's a second slot, loop the strap around the bottom of the pedal and tighten it as you normally would (just as one would with MKS GR-9 or GR-10 pedals, which also have one slot). Physics will prevent the strap from coming off when your foot is on the pedal and in the straps.

Because you probably want visual proof: