A shallow wooden crate or display shelf can look square on the bench and still twist a little once it is carried, loaded or set on an uneven counter. The problem is not always weak wood; sometimes the box just needs one quiet brace to stop the corners from arguing with each other.
A scrap cleat is a good low-fuss answer. Cut a narrow offcut that fits inside the back or underside of the crate, then dry-fit it across the corner line before reaching for glue or screws. It should support the shape without becoming the first thing a customer sees.
On light display pieces, place the cleat where it helps the crate resist racking: along the inside back rail, under a shelf lip or behind a divider. Keep it short enough that it does not block bottles, cards, tools or whatever the crate is meant to hold.
Pre-drill the cleat if the surrounding wood is thin. A small pilot hole and a dab of glue are usually neater than forcing a screw through dry stock and splitting the edge you were trying to save.
The best test is simple. Set the crate on the bench, press gently at opposite corners, and watch whether the opening stays true. If the cleat holds the shape without pulling the box out of square, it has earned its place.
Practical takeaway: before rebuilding a wobbly shallow crate, try one hidden scrap cleat. Dry-fit it, pre-drill it and keep it out of the useful storage space so the repair adds strength without clutter.
Display CratesShop HabitsWood Repairs