Hello PF. A moving clock is seen by the platform observer to run slow. This applies to all clock constructions. A light clock runs slow because the light path lengthens and the clock takes longer to tick over. Other types of clocks don't have a light path to lengthen. By what mechanism do they run slow? If the answer is, there is no mechanism, time just slows and the clocks record that, then why does the light clock not only slow but also shows the mechanism by which it slows i.e. longer path? Regards.