What Pads Actually Do

Pads (typically felt or cork covered with leather, skin, or synthetic material, depending on the instrument and specific key) seal a tone hole when the corresponding key is pressed — a pad that doesn’t seal completely (from wear, a tear, or being seated at a slightly wrong angle) causes an air leak at that specific tone hole, which is one of the most common woodwind repair complaints across clarinet, saxophone, and flute.

Diagnosing a Leaking Pad

A feeler gauge (a thin strip of paper or a proper diagnostic gauge, depending on shop practice) tests seal quality at each pad by checking for resistance when pulled from under a closed key — a pad that releases the strip with little resistance, or unevenly around its circumference, indicates a seating or seal problem needing correction.

Correcting a Poorly Seated Pad Without Replacing It

Not every leaking pad needs full replacement — sometimes careful heat-and-adjust technique (gently warming the pad cup’s adhesive to allow the pad to be re-angled for a proper seal) resolves a seating issue without the cost and time of full pad replacement, and recognizing when this lighter fix is appropriate versus when full replacement is genuinely needed is a real diagnostic judgment call.

When Full Replacement Is the Right Call

A torn, hardened, or significantly worn pad needs actual replacement, not just reseating — correctly identifying pad material and size for the specific instrument and key position, and properly seating the new pad with correct spring tension restored afterward, completes the repair.