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To retract these cheap hotel retractable pens, you simply turn the top of the pen. On average, after 50 times of retraction, even when I can smoothly turn the top, the tip no longer emerges! Why?

enter image description here

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    $\begingroup$ Can you post a picture of one torn apart? Fwiw: This looks more like a collectors collection than "a bunch of cheap pens", re the question one would assume a worn interface of some kind. so... teardown would reveal that interface $\endgroup$
    – twobob
    Jun 7 '20 at 3:23
  • $\begingroup$ @twobob The pen itself isn't "torn apart". It looks perfectly normal from the outside. Would you still like me to take apart a pen and photograph it? $\endgroup$
    – NNOX Apps
    Jun 7 '20 at 5:14
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    $\begingroup$ Of course. We need to see the mechanism and any wear on it. $\endgroup$
    – Transistor
    Jun 7 '20 at 12:01
  • $\begingroup$ Just love the name Accounting and cheap pens. $\endgroup$ Jun 8 '20 at 3:44
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Perhaps the refill needs to be screwed back in firmly inside. Those pens usually pull apart.

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