Installation Precautions:
1. Be sure to align the rear derailleur with the rear hook. Do not screw it crooked. This will easily damage the rear hook thread. If the screw is only screwed in, no great effort is required if it cannot be screwed in. Do not tighten the screw as tight screws will definitely damage the thread.
2. After installation, you should check this before driving. If you do not set it well or there is a problem with speed change, you can immediately deform and break when you ride on the gear or pedal.