well, i can do the trick, but the mount don’t look like an houer glass. it is more like i am having the triangle on my th, but its edge dont meet the other triangle. so it is just like i am having too small hands to open it right. enny tips?
You can adjust the size of the triangles by twisting your wrists and allowing the strings to slide. Hope that helps. Keep practicing, and you will get it. I promise. 
Thanks!! I’ll try that