Tap handle stiff or hard to turn

A stiff tap is usually caused by one of three things: dried-out seals, limescale build-up on the spindle, or worn ceramic discs that have roughened and are grinding against each other. The fix depends on the tap type.

For traditional pillar taps (cross-head or capstan handles): the headgear (the brass spindle assembly) may have dried out or scaled up. Turn off the water, remove the handle (one screw under the cap), and unscrew the headgear with a spanner. Inspect the brass spindle — clean off any limescale with white vinegar and a toothbrush, then apply a small amount of silicone grease to the thread and the rubber washer seat. Reassemble and test.

For ceramic disc taps (quarter-turn handles): the ceramic discs inside the cartridge may be scaled or worn. Remove the cartridge (as described in the cartridge replacement guide), and clean both ceramic surfaces with white vinegar if scale is visible. If the discs are scratched or chipped, replace the cartridge.

For monobloc mixer taps: stiffness is almost always in the cartridge. Replacement cartridges are widely available and relatively cheap — this is the most cost-effective fix for a stiff monobloc mixer.

Do not use WD-40 on tap internals — it is not a long-term lubricant for water-carrying components and may contaminate the water supply. Use only food-safe silicone grease specifically intended for plumbing use (Fernox Leak Sealer products, or a generic silicone tap grease, £3–£5).

If the tap body is very old (30+ years), corroded, or the thread is damaged, replacement is often more sensible than repair. Modern mixer taps start from £30–£50 and are significantly easier to operate and maintain than period fittings.