Donald gets his head stuck in a gear on the balance wheel shaft. The fork provided greater accuracy than conventional balance wheel watches. Instead, their rate is adjusted by timing screws on the balance wheel. The key was to make the balance wheel change size with temperature. The off-centred watch dial is notable with a view of the balance wheel. Clocks keep time by mechanical resonance in a balance wheel, pendulum, or quartz crystal. This type of balance wheel had two semicircular arms made of a bimetallic construction. The balance wheel keeps time for the watch. Many clocks keep time by mechanical resonance in a balance wheel, pendulum, or quartz crystal. One of them is easily taken away, namely heavy points on the balance wheel. The balance consisted of a circular steel balance wheel with two bimetallic strips attached diametrically.