The main connector can become loose and if you dont have a proper wrench you could damage the wiring. This allows you to hand tighten the nut while holding the connector with crescent wrench to fix the issue

How to use:

1. Tighten the nut manually and place the printed wrench
2. Using a cresent wrench or similar, hold the flat sides of the thread
3. Tighten the nut with the printed wrench, since is held on rubber, you can achieve a great pressure to prevent it to become loose again