In jewelling a pair of dead-beat regulator pallets, the pallets must first he softened, then wide and deep slots must be filed out where the teeth engage with them. Jewels (rubies, garnets, or agates) are then cut and polished to fit exactly the grooves and are cemented in with shellac. Their outside surfaces are then polished off Mush with the steel on all faces. For rubies and garnets, the cutting and polishing is done on steel or iron laps with diamond dust. Agates, being softer, can he cut by emery used in the same way.