Curtain Rod Tiny

how to make or hang up curtain rod with minimal wall damage?
have an apartment and cant make holes in walls. no screws allowed just tacks and tiny nails. any suggestions on how to hang up curtains?
I would use nails anyway and just patch them when i left. but if you don't want to risk it get some picture hooks and run a small wire between them. make sure the hooks are stout because you want the wire fairly tight so it won't sag in the middle.
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