Hi guys,   I wrote this lesson for my second students to understand the theoretical aspects of the Swiss lever escapement in conjunction with the practical application of end-shake and setting jewels using a jewelling tool. Both Seitz and Horia-type jewelling tools were used. Although I talk about measurements using the settings on the side of the jewelling tools, it is more about what 'feels' right, especailly when gauging the end-shake of a particular component, such as the balance,