Hey guys, I need help. I watched a video on youtube of a guy making a knife sheath. The needle he used appeared to have a "hook"on it. He would work the needle through the leather and then he would hook the thread over the tip and bring the thread back through to form a loop. He then pulled the loose end of the other end of thread through the loop and then pull every thing up tight. My question is where do I find one of these needles? Do I have to file a notch in one myself or can I purchase it this way. Thanks for the help.