How to Attach a Rotary Potentiometer on a pendulum?

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I have across a very useful description of pendulum model in the webpage, http://ctms.engin.umich.edu/CTMS/index.php?aux=Activities_Pendulum
However,
I could not make out how they have actually attached or mounted the rotary potentiometer shaft on the pendulum rod.
A better image is also available in the link http://ctms.engin.umich.edu/CTMS/index.php?aux=Index_Activities
How can we ensure just the shaft to rotate and not the cap? Any thoughts?

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