That hole in the back is a godsend, makes tensioning extra easy. I wrote a
guide on these a while ago, should help you get it open. Try picking it from the open position back to locked with the shackle open first, so you can see the levers. Good way to make sure your wires are working properly before you attempt to pick it properly.
Edit: Forgot to add, the actuasl diagrams aren't in the original post. Check the 5th post down.
