What is the primary indicator that the internal tolerances of a click pen mechanism are wearing down over time?

Answer

The mechanism develops play, causing the tip to rattle when locked out

Mechanical fatigue in the cam or ratchet system results in 'play,' manifesting as the tip rattling slightly even when it is supposed to be securely locked in the extended position.

What is the primary indicator that the internal tolerances of a click pen mechanism are wearing down over time?

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