When a Watch Cushion Sags, the Sponge Is Rarely the Problem腕表托盘的枕垫塌下去，多半不是海绵的问题

After a year on the counter, the cushion of a watch tray develops a dent in the middle. Most people blame the foam. Take the tray apart and you usually find the foam was only carrying the blame for something else.

Take the S7 watch display tray. It is modular: independent units that assemble to whatever length the counter needs, with champagne-gold satin cushions set on a deep green base. The contrast does a lot of work for the dial. The core is foam, yes, but three other things decide how long it lasts.

Density comes first. Cushion foam usually sits between 25 and 35 degrees of hardness. Too soft and it cannot carry the case, especially a steel bracelet: a dent appears within months. Too firm and it will not hold the strap, so the watch slides when a customer picks it up. The test is simple. Press a finger in, release, and watch whether the surface returns within two seconds. Anything slower is too soft.

Second is the tension of the covering. The satin has to be pulled tight over the core. If it is not, the fabric creases where the clasp sits, and that crease presses back into the strap and leaves a mark. On our side we take an extra tuck at the back to lock the tension in. You never see that tuck, but it is the reason the surface is still flat six months later. Satin weight matters too: too thin and the colour of the core shows through, which is very visible in a pale shade like champagne.

Third is the base. The S7 uses a high-density board because the base carries load once units are joined. A lighter board starts to flex past three modules, and then a customer touches the counter and the whole row of watches trembles. If you are filling a long run of four or five modules, say so up front; the base needs to be thicker.

One detail is easy to miss: the joint gap. With modular units, the space between two trays depends on how accurately the locating groove is milled. Too tight and the units push against each other as temperature changes, eventually splitting the fabric. Too wide and the display looks disjointed. A millimetre or two, controlled by dowels in the base rather than by a worker pushing the units together, is what works.

Maintenance is not complicated. Satin dislikes sunlight, so a window counter wants a blind; UV turns champagne gold into a greyish white. Move and rotate the watches once a month so the foam has time to recover from constant pressure. Dust with a soft brush along the grain. Do not wipe with a damp cloth, because satin dries with water marks.

One more trap, this one about size. Cushion diameter should sit just under the inner circumference of the strap. Too small and the case will not seat; too large and the watch turns in the tray, which reads as untidy on the counter. Men's cases mostly run 40 to 42 mm, so that is the range to work around. If the counter mixes ladies' pieces or pocket watches, order two sizes rather than expecting one to cover everything.

If you are specifying trays, do not open with price. Ask three numbers instead: foam density, base thickness, and what controls the alignment between units. Once you have those answers, the price difference explains itself.

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Junyimei — every millimetre of a watch display should serve the hand that picks it up.