Bad batch of cards, or reader/writer issue?

[Massimo Gnerucci]

(08-10-2021 05:44 AM)teenix Wrote:  I have a HP-41 card reader repair in progress so I decided to find out how the eccentric cam works as I couldn't see a reason for it to change its position when the shaft is turned.

Thank you very much Tony, but may I stress that a (tagged) image is worth a thousand words? :)
I can easily miss or misunderstand some/many of the terms used...

Thanks again!