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[quote=Vladi]"Selbstsch

I don't see any problem with this word. But I admit that my translation was not too exact. For the present in your example it is better to use the verb "пользоваться": "Они пользуются машиной, чтобы...

1. You have to use screwdriver to open the device - Для открытия прибора используйте отвёртку.
2. Use a lot of force! - Приложите значительное усилие!
3. They use car to travel there - Они...