Stabilizer

A stabilizer is a small mechanism, usually a metal wire connected to plastic housings, mounted under any key wider than a standard single key, such as the spacebar, shift, enter, and backspace. Without it, pressing one edge of a wide key would tilt and bind rather than press down evenly.

Stabilizers come in a few mounting styles, most notably screw-in, which bolts directly to the plate or case, and clip-in, which snaps into place without screws. Screw-in stabilizers are generally considered more stable and less prone to shifting over time, which is why most enthusiast keyboards use them over clip-in versions.

Out of the box, many stabilizers rattle or click because of loose tolerances between the wire and housing, which is one of the most common complaints from new keyboard builders. Applying lubricant to the wire and housing contact points, and sometimes adding a small foam or fabric pad, reduces this rattle considerably, and is usually the single most noticeable mod a beginner can do to improve keyboard sound.