Success depends on a sound and well thought out design, appropriate material selection, sensible detailing and construction, and a manufacturing process which produce the components to the desired tolerance and finish.

All the clocks are fitted with the Harrison type maintaining power, which ensures the clock keeps running during winding. The accuracy of the clocks is in the order of 10 seconds a day. This accuracy is dependent on a number of factors, such as the type of escapement mechanism used, the consistency of the power source, the design and stability of the pendulum and bob, and the overall smooth operation of the wheel train. Most of Will’s clocks employ the Brocot dead beat escapement, as it provides easy adjustment and trouble free operation. He has also produced other clocks using the Harrison Grasshopper escapement. Will's clocks are either weight or spring driven, giving an 8 day running period.