The tooth flanks of steel wheels are to be polished with wooden wheels.
The surfaces of the main and any secondary plates are decorated with circular graining. The full-height plate cut-outs are chamfered, the sinks polished.
Rate accuracy adjustments must act on the inertia of the balance wheel assembly. Regulators with index pointers or slots are also permitted if they incorporate a steadying device, except in ultra-thin calibers where such regulators are not required. In conventional balance wheels, the rim must be chamfered and diamond-polished. The spokes must be sandblasted or circular grained on the top side. The spokes and the rim must be meticulously finished on the bottom side.