Thanks. I'm currently using the 20oz pull reel with the 28" cord and it seems fine. With this set-up there is no need to connect it to my chest harness, but I could if needed. I just clip it to my swivel.
Here is one I made with a Camp Turbo Foot and a Key-Bak Securit reel. It works well with either the 13oz or 20oz pull reel. Overall weight is just under 6 ounces.
I'm new to tree climbing and made this before I discovered this thread and realized I wasn't the only one thinking along these lines.