Spring-loaded fin bolt. First, place the plate into the box, then set the fin on top and secure it with a bolt. This one item has changed the process, allowing you to attach the fin with one touch and making it easy to move the fin. First, pass the spring through the body, then pass the body through the hole in the fin. Align the hole in the body with the spring with the base and tighten the set screw with a hex wrench. (Photo 3) *Please refer to Photo 2 for the part names. Next, set the fin in the box (Photo 4). Finally, turn the protrusion (knob) and the fin will be completely fixed in place. (Photos 5 and 6) It's a very simple design, yet very useful idea.
