Bally's Score Motor design changed quite a bit over the years, depending on the style of game they were making.  In a future episode, I'll dive into the control unit, which is a beautiful, complex electromechanical marvel.
This episode, however, I talk about the relatively straightforward, no-frills Bally score motor, its ease of adjustment and common issues (really the same common issue that plagues most score motors that have been sitting and transported many times without being used for a long period of time).