The Container Store Linea Leaning Bookcase Assembly Instructions Manual page 8

step 5.
If you have purchased multiple leaning bookcases or desks,
use the mending plates to connect multiple units together.
(H7) x 2 (H8) x 4
mending plate flathead screw
1. Locate pilot holes on the backs of the legs.
2. Use the small flathead screws to attach the mending plates.
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