Fix a Loose Door Knob in 5 Minutes

A loose knob means the set screw is either missing, loose, or stripped. This is a 5-minute fix 95% of the time — no special skills needed.

Step 1: Locate the Set Screw

1. Look for a small screw on the side or bottom of the knob (usually hidden under a decorative collar or cap).
2. If there is a decorative ring around the base, gently pry it off with a flathead screwdriver — the set screw is underneath.

Step 2: Tighten It

1. Insert the correct screwdriver (usually Phillips or flathead, 2-3mm).
2. Turn clockwise firmly — but do not over-tighten, or you will strip the thread.
3. Test: the knob should not spin when you hold the base.

Step 3: If It Still Spins

1. Remove the set screw completely.
2. Check if the metal insert on the shaft is stripped (crosshatch is worn smooth).
3. If stripped: replace the entire knob (10 minutes, see products).
4. If not stripped: the set screw itself may be stripped — replace it with a slightly larger diameter screw or use a threadlocker (see products).

Pro tip: After tightening, apply a tiny drop of threadlocker (like Loctite Blue) to the set screw. This prevents it from vibrating loose over months — a common cause of the problem returning.