I have an idea here guys. Bear with me. A single piece of appropriate strength square tubing about 18" in length (shorten to preference. I got big trees). About 6"off center of your tubing either way drill a 3/8" hole through. Then cut from one side to create a rounded notch. Rotate the tube 90° so the notch opening is facing you. To the outside edge of each notch, about .25" or more, drill a .25" hole through. Then take a piece of flat metal strap the same width as your tubing. Use a self taping screw and attach the strap to the inside side of the notch. Leave the screw lose enough you can rotate the strap over the opening of the notch. Rotate the strap and drill a .25" hole in it that lines up with the .25" hole in the tubing. Repeat the process 6" off center on the opposite end of the tubing so your notches with covers are 12" apart. The notch openings and covers are now the bottom of the bar. Go to the opposite side, the top. Drill small holes to accept pop rivets on the outer ends and wide enough in for your boots to fit between the holes. Cut yourself 4 nylon straps and rivet one with a washer in each hole. Setup the straps with whatever hardware you want so they can adjust and fit your boots. Finally add some skid tape for traction if you like.
Now go to to your local cable or fitting store. Get them to make you a .25" cable that's 36" in length (adjust to preference). Have them pressure fit those metal nubs on the ends AND THEN every 3" in along the cable for both ends. Do however many knobs as you want. Get two .25" safety retaining pins while you're there for later
To use, swing the covers so the notches are open. Flip your cable around the tree. Pull the cable firmly around the tree and place in the notches with the little knobs holding the cable length in the tube. Close the covers and lock with your safety retaining pins through that outside cover hole. Make sure the tubing step is above the cable. Place your feet through the loops, adjust bit straps, and start climbing like you would a climber tree stand. The tubing should push down on the cable pulling it tight. This way there's no weight being placed on those covers which should be facing down.
What do you think? Crazy? Do my instructions make sense? I realize I'm just spit balling here. Maybe I should draw up the design to help with the visual.
Sent from my SM-T900 using Tapatalk