Systems and methods for stabilizing laser frequency based on an isoclinic point of an atomic or molecular medium are provided herein. Venue-based data can be acquired from one or more venues. The retractable step system comprises a pair of longitudinal rails which are extended when the system is in the use position and collapsed when the system is in the stowed position. A great number of other features and technologies are also detailed. A pivot adjustment mechanism allows adjustment of the lever’s mechanical advantage, and a stroke adjustment mechanism allows adjustment of the lever’s rest position.