Maintaining the lever.
https://drive.google.com/file/d/13i8b2JrYeFl9D8oC5xHs8kIjB-VOVQeW/view?usp=drive_link, https://drive.google.com/file/d/1zTsW5HYKZjfup8cUAfDAduW1cXdXw0lX/view?usp=drive_link, https://drive.google.com/file/d/1f730cFM2yZfhdTl2t3Jn_uFMRzpHR3OP/view?usp=drive_link, https://drive.google.com/file/d/1tPswcg2mjHnTCQkKbY81sWl8AsygWzHe/view?usp=drive_link