Below is the instructions manual that explains how to install a UDH hanger on a frame. UDH USER MANUAL (Universal Derailleur Hanger) INSTALLATION Insert the UDH hanger into the frame and rotate it to the correct position. Install the frame-specific washer then thread in bolt to the left. Tighten the bolt with 25Nm torque. Apply thin layer of grease to thru axle before installing. NOTICE Do NOT apply grease to the UDH hanger, bolt or frame. NOTICE Bolt is left threaded. Rotate counterclockwise to tighten. NOTICE Ensure hanger is correctly in place before tightening bolt.