I traded that grapple years ago with Paul Hepler for a much heavier one that I was using. One of the problems that I have had with the GoPro is the extreme green color in the videos. I am trying to filter some of that out in software. I am going to try a Magic-Filter soon but it might not work so good because it reduces the light by 2 f-stops. I have used it with still cameras but I can up the ISO on them. We shall see. And, bartman, I seem to remember that you are the moon snail guy. So this is for you: