Originally Posted by Mentor58
Can you thread a hex shaped hole?
Yes, if you are careful to get things lined up straight. I have threaded (6 mm) the recessed pivot bolt on my rear Ultegra brake and I mount the strut on my Tubus Fly Rack there (The bottom mounts on the QR). This gives me a small, very light-weight but strong (rated at 40 lbs.) and sturdy rack to carry rain gear, etc on long rides and because everything is mounted in my wind shadow there is little extra windage.