In the dim light, adjusting the escapement – called achevage – ensures the distribution of the balance wheel’s force. The operation is controlled by projection. It is extremely painstaking work because tuning the pallet to the escapement wheel and the balance demands very nimble fingers. In a brighter room, some operations such as placing the balance wheel and the balance-cock on the movement, levelling and centring the hairspring on the balance, allow the movements to start ticking. The success of these operations ensures the watch’s accuracy for generations to come.