I have a Lexus rx300 1999
the retractable cover cargo is not working....
does any one can give tips about fix it.....
something with the spring.....
thx

 

I never dismantled this one, but I did do one recently in a Subaru Forester where the cover detached from the roller. It's pretty simple inside.
If the spring came loose maybe you can reattach it. Once reattached you have to wind it up to pretension it.
If the spring broke beyond repair you're probably best off finding a used cover on eBay.

 

I am pretty sure it is 1 size fits all on RX on these eg a 330 will fit i believe.