Having never used the renault jack i cant remember what they look like or how they fix on, but my guess would be trolley jack, block of wood... hey presto!
nothing unsafe about it really, just change the oil, clean it up, jack up the car, get an axle stand under there, done
are you doing it right twist the handle anti clockwise until it stops then try and jack it up. if that doesn't work it needs oil.
are you doing it right twist the handle anti clockwise until it stops then try and jack it up. if that doesn't work it needs oil.
are you doing it right twist the handle anti clockwise until it stops then try and jack it up. if that doesn't work it needs oil.
clockwise
you can straighten with some mould grips