I am looking for a binocular harness system, and I am 99% sure I am going to be using this system. My question is about the bottom attachment. In there video they show that you can (Velcro?) something to the bottom for a rangefinder. I am not seeing on their website or on youtube, how this system actually works. If you have one or had one and can you please let me know how this actually works. Thank you.