Have you anchored leaning bookshelves?

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I bought leaning shelves before DS was born, but they didn't come with anti-tip hardware.

I want to anchor them now, but am unsure of the best one to use.

Has anyone anchored their leaning shelves? Which strap/device did you use?

[emjacobs]

The ones I've seen have a spot in the tall side piece that you can slip on a screw head. If the shelves get close to the wall you could use an L bracket on a few to anchor them but it wouldn't be attractive.

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Thanks!!