Point-Mass analysis was done using Python code (https://github.com/techno-sam/pendulum_clock_calculations/blob/main/simple_calculation.py) and the period was determined to be 0.5559 seconds.
Inertial analysis was done using Python code (https://github.com/techno-sam/pendulum_clock_calculations/blob/main/inertial_calculations.py) and the period was determined to be 0.6199 seconds.
A 2D drawing of the pendulum was imported into WorkingModel 2D to determine a period of 0.6929 seconds.