Hey guys. I basically have two square bars of steel that I want to use one bolt to attach them to make a pivot point. But when I tighten the bolt I want it to be strong and not slip. What is the best way to accomplish this? I'm considering something like machining these geared type steps into the face of each bar at the contact point (basically a raised integrated 'washer') but is that the best method for this? This would only allow the bars to lock into place at specific angles though...