How to assemble flat-pack furniture without losing your weekend

Assembling furniture with a Kelvin 23
Kelvin Tools

Flat-pack furniture is designed to be assembled by one person with no tools, which is why it takes two people and every tool in the house. The instructions are fine. The process is what fails. Here is a sequence that works.

1. Sort before you build

Open every bag and lay the hardware out in rows on a piece of cardboard, grouped by the letter in the manual. Count them. Missing parts are easier to spot now than at step 14, and loose screws stop rolling under the sofa. If you are using a Kelvin, the magnet on the arm is a good place to park the screw you are about to drive.

2. Build on the box

Flattened cardboard protects the floor and the panels. Keep the finished faces down on cardboard, never on tile.

3. Cam locks: snug, not tight

Cam locks (the round discs that turn a quarter) hold by friction. Turn them until they stop and no further. Over-tightening strips the particleboard and the panel will never sit flat again. A screwdriver with a locking arm, like the one on the Kelvin 23 or Kelvin 36, gives you enough control to feel the stop.

4. Retire the stamped Allen key

The folded metal key in the bag rounds off bolt heads and your knuckles. Use a proper hex bit. The Kelvin 17 ships with three Allen bits and the 36 with a full set among its 26, so the bolts seat straight and the key goes in the recycling.

5. Leave everything loose until the end

Assemble the frame with every bolt a half-turn from tight, square it up, then go round and tighten. Panels that are tightened one at a time pull the frame out of square, and the doors never close right afterwards.

6. Back panel: tap, do not hammer

The hardboard back is held by small nails. Tap them with a light hammering surface and let the weight do the work. The cast surface on a Kelvin is sized for exactly this.

7. Check it with a level before you load it

A bookcase that leans a degree empty leans two degrees full. The built-in level on the 17, 23 and 36 is enough to catch it, and a folded piece of cardboard under one foot usually fixes it.

Total time saved is hard to prove. Total swearing avoided is obvious.

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