Use self-locking (screw-)nut, which have a nylon insert that does not allow screw-nut to spin!
Используйте гайки самоконтрящиеся, которые имеют нейлоновую вставку, которая не позволяет гайке раскручиваться!
website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.