In a marina, you have boat slips. The docks between boats are called finger docks. These dock sections are often very twisty at the end. If they are made out of wood, the boards flex enough they feel tipsy. The solution is here… A pipe does not twist. Using two of these brackets you can install 1.5″ schedule 40 galvanized pipe to run above your flotation and below your decking. This socket gets bolted to each end of the finger dock and the three set screws tighten into the pipe on each bracket. Now when you walk out to the end of the finger, you will not see the same amount of twisting between the stringers on each end.
We have been using torsion bars for over 30 years by welding a plate on each end of a long pipe. We just came out with these torsion bar sockets a few years ago because they are much easier to ship than the entire length of pipe. Now anyone can buy a pipe and build their own torsion bar to make finger docks more stable when boarding boats.
Here is a Framing Plan of a finger dock that uses a Torsion Bar.